I highly recommend Duccio's place! It was a perfect place for our group of 7 people. It was conveniently located (only 15 minutes walk from the train station, lots of tourist attractions, and tasty restaurants) and it was very spacious and clean. We loved the super high ceilings, the large kitchen, and the dining area.
Communication was super easy with Duccio and he was very accommodating and helpful suggesting places to go and wines to drink.
If you ever find yourself in Firenze you should book this Airbnb.