Thanks Gerri and Roberto. Hah! I'll resist calling up Renzi, but thanks for the tip.
Roberto, we are visiting friends for 2 jet-lagged nights only, then returning to Florence centre for 3 nights. They seem to be located just outside Bagno a Ripoli in Rignano Sull'Arno, but pretty close to San Donato, maybe 5-10 min drive. Definitely boonies albeit nice upscale boonies, as far as I can tell from the pics. Will most taxi drivers at FLR be willing to drive us to Rignano do you think, so we don't need to pre-pay a private transfer service?
We have not seen these friends in awhile, they haven't been too specific about needing a car or not, in spite of my asking. They've mentioned needing one to sightsee but, frankly, I think we will be happy to just to see the sights by the pool... and nap!
Any idea if June 24 holiday will make the airport rental car agency experience worse than usual? Any idea what the "usual" amount of time required is? I understand there's nothing in-terminal but a shuttle to all the agencies (I've tentatively booked with Avis). Not really keen to spend 1+ hour queuing and doing paperwork, with tired kids in tow, then navigating out to Rignano...
I don't mind spending a few extra euros on taxis but I haven't ruled out renting a car in case we really need one to go out for a meal or two with our friends... we don't really know how (in)convenient it would be for our hosts to help call/book taxis to their country house. I expect any restaurant in the area would be a 10-15 min drive... can't expect them to have a 9-seater to drive us all :-)