We used Prestige Rent. The driver picked us up at our Florence Airbnb on time at 9am. He was driving a spotless Mercedes sedan. There were 3 of us. Me, hubs, & new Aggie grad daughter. We did the custom tour. We went to Greve, San Gimignano & the Verrazzano winery. I don't recall the specific order of stops but it was all planned around the tour that I booked at the winery. He did a little bit of narrating of the area on our drive & then dropped us off at each spot to explore on our own. It rained off/on that day so we didn't stay long in Greve so he drove us thru some other areas & returned us to our apartment 8 hrs later. The cost was 450 euro plus a tip. This was much better than spending time going to rent a car for the day & trying to find our way around the countryside. I do think that would be fun to spend a few days exploring the region by car but we only had one day to spend in this area. We don't normally do organized "group" tours preferring to explore on our own. This was a splurge to hire a private driver & the best choice along w/the private boat tour we took in Capri. The 2 best parts of our 3 week trip.
https://www.prestigerent.com/Verrazzano Winery- My son lived in Italy for 5 months & recommended this place. It is beautiful. We visited on an Italian holiday so the only tour they were offering that day was the Sabato Special. Initially I was disappointed because I really just wanted to do the wine tour & not overpay for lunch that I presumed would be some cheese & crackers. Boy was I wrong! The multi course lunch (served w/wine) was AMAZING! The Italian women were right there in the kitchen cooking everything fresh.
https://www.verrazzano.com/en/