Not sure if your questions are directed at me.
Il Riccio is located on the edge of Piazza Grande. It's a good location for a hotel, but it's not the best location for a car. The Riccio's five, free parking spots are located about 800 feet away in a private, outdoor parking area next to the Fortezza. I am assuming the Riccio will give you temporary permission to drop your luggage directly in front of the hotel before you park your car in one of their free spots. You will need to verify this. Cars are normally not permitted in Piazza Grande, but hotels are supposed to get a small timed window, allowing guests to park directly in front to load and drop luggage. If they do grant permission, make sure they give you a print-out paper that says "CARICO SCARICO BAGAGLI" that you can place on your dashboard while you are parked in Piazza Grande.
If the hotel does not have an arrangement with the city (I doubt this is the case), you'll need to drag your bags the 800 feet, to-and-from the parking space.
There will be a learning to curve to find the Riccio with your car and to find their parking lot. Once you do it one or two times, it's a piece of cake. I strongly suggest you follow their recommended route in Google Streetview. Learn how to use Streetview and practice your drives there before you go. Streetview is the greatest driving tool for first-time efforts.
I've been using the car rental offices on Borgo Ognissanti (nearest the train station) since I was in my 20's, pre ZTL. I can make the drive with my eyes closed. Depending on where you research, certain people will scream the horrors of dropping a car on Borgo Ognissanti, and they will insist you drop your car at the airport. If you are not a person who is easily scared, if you are motivated, if you learn Google Streetview, you can figure out the correct route to return your car at the Borgo Ognissanti office. IMO, this is the most convenient place to return a rental, if you have luggage, if you plan to take a train, or you plan to stay at a hotel in Florence. Research the route on your own, and let me know what you find. I'm happy to help you after that.