Car Transportation to/from outlying area/"suburb" of Florence

This seems like a perfect set up for having a main meal midday. When you are back at the villa, you can gather round, drink wine, eat snacks like cold cuts and cheese, and share your day’s adventures.

Although I have no experience with it myself, I have heard of groups hiring a local cook or chef to go out to their villas and prepare a meal. Or perhaps it would be possible to find a cooking teacher who would do a late-afternoon/evening class for those who are interested, thereby killing two birds with one stone.

Otherwise, I agree that a big lunch followed by dinner nibbles would work well. I could not possibly eat two Italian restaurant meals in one day. I've usually bought some combination of cheese, yogurt, fruit, tomatoes, cucumber and bread for a light meal. I assume the group is going to have at least one car available; otherwise, how will you deal with breakfast provisions?

Have a big lunch out to eat where ever you are visiting during the day. At night, salad, cold cuts etc. I had heard so many friends end up in this predicament, stuck far out of towns in villas, that our first requirement when renting one was that it be easily walkable to a town with restaurants.

Tuscany is really best seen by a rental car when you're in an agriturisimo or villa. The roads are crooked, well paved, well marked, and easy to drive.

Uber Black is not banned. Uber decided to exit the Florence market because not profitable.

Uber Black wouldn’t be a cheap alternative anyhow. The cheaper alternative, and the only sensible one, is to rent a car.

What do people do in America when they choose to spend a vacation in a country home? In my experience they all rent cars, whether it’s in Napa, Sonoma, Lake Tahoe, or whatever.

Italy is not any different. Public transportation is for cities.

I might imagine that the villa owner would be the best source of info for the type of transport you're looking for, if available. Have you communicated with them?

That said, I'd guess that Roberto hit the nail on the head: staying in isolated country villas or agriturismi pretty much requires a rental car for efficient sightseeing. They're otherwise not really good accommodation choices unless intending to spend most of the time relaxing at the villa itself or hiking to towns nearby enough to do so.

Thanks, all.
It's a weird situation for me. Usually, I get all in to the details and logistics of a trip like this, but it's not really "our" trip. We're just showing up happy to be there. But as it approaches, I'm getting anxious about a few things like this. I thought about rental car, but as I said, we're not the only ones, and we do have a few private transfers lined up for things involving large portions of the group. Makes me not want to just have a rental car for some of us but not others, especially since we've already splurged for transpo on several days. So I was trying to see if small towns like Tavernuzze would have a their own taxi service which would work really well for those days when you ordered poorly at lunch and come home "hangry". :)
I've tried to investigate on my own and will continue to do so, but I'm always impressed by the wealth of info I can get from the seasoned travelers here and thought I'd toss out a life line.
We do have access to the kitchen (this place is kind of a hybrid villa/resort) but they give a lot confusing information and it's all being filtered to me second hand. We DO intend to cheese-and-wine it on a couple of evenings.
Maybe I just need to take a few deep breathes of Tuscan air and chill the heck out, eh?

I've been to Tavarnuzze and it's a pretty quiet little town. It does however have good bus service into Florence on the #37 bus line, and buses run from early until fairly late (about 10:30pm). The bus trip takes under 20 minutes to Oltranrno and about 25 minutes to Piazza Santa Maria Novella (not the train station). I have friends who live nearby and go to Tavarnuzze often for their son's soccer matches. I'll ask if they have any thoughts about dining and local transportation.

UPDATE: My friends said that dining choices in Tavarnuzze consist of one pizzeria. They suggest going to Imprunetta where you'll have many more options. They also confirmed that without a car you'd have to call a taxi from Florence for local travel, which they said would be expensive.

The suggestion to spend evenings when you're back early relaxing and dining at the villa is a good one. There's a big really nice Essalunga grocery store in Galluzzo that you may very well pass on your way back by private transfer. Maybe you could arrange for the driver to make a shopping stop.

Taxis might go that far out. Your host would probably know for sure. I've taken one to Cascine del Riccio area which is slightly closer to town, and it's inside rather than outside the expressway. I'd ballpark the cost at over 30 euro each way. Also keep in mind that a standard taxi will only accommodate about 4 people, so it sounds like you'd need multiple taxis. That could make it more challenging and they might not all arrive at the same time.

Tavarnuzze was a village and now it is a district of the incorporated municipality of Impruneta.
Small towns, like Impruneta, don’t have their own taxi service. At most there might be a limo driver based there who can provide prearranged transfers. The official designation for limo drivers is Noleggio Con Conducente (Hired car with Driver) or N.C.C.
If you Google NCC Impruneta someone might come up, however for regular taxi service, the Imprunetans rely on Florence taxi service. Taxi drivers in Italy are individually licensed and owners of the taxi. Italian law does not permit issuing taxi licenses to companies, only to individuals.
Individual taxi drivers however always join taxi associations, known as taxi cooperatives, to share common business costs for the members (e.g. radio dispatch, advertising, etc.). They are listed below
https://www.visitflorence.com/moving-around-florence/by-taxi.html
You can call them or use their app and they will pick you up and take you wherever. Just be aware that the meter starts from the moment the taxi is dispatched to you, not when they arrive at your location.
Because of these reasons, regardless of what the rest of the group does, in your shoes I’d rent a car for you and your family. With $200-250 you can rent a car for a week. A trip by taxi from that villa to Florence is at least 25-30€ each way, so taxi rides add up.
Make your choice, and if you are coming to Florence soon, I can tell you that it is scorching hot and also a bit muggy. The city has issued a code red again for today.

Also, if you have a car, you can make a grocery run or two and bring back supplies for a few home cooked dinners as well as breakfast items for everybody. Also, don't miss the Florence-American Cemetery just 1 1/2 miles up the valley from Tavernuzze. Nearly 5000 graves of American soldiers who died in WWII fighting in Italy.

There is also the option of hiring a chef to come to the villa to cook dinner for the group. We did that in Panzano, and it was terrific, not terribly expensive either.

The first wave of our group is at the villa.
What I feared was an issue - but the on-property management (like I said it's an unusual combo of villa and hotel) will call cabs for local grocery and restaurant excursions and will arrange chefs with a day's notice)
So whew! and thanks!