The place is hard to fault. The location is sublime, so close to all the main attractions but hidden away in a quiet but energetic area. There are so many cafes, restauarants and bars within less than 5 min walk.
The apartment itself was very spacious and had all the amenities needed, including 2 fantastic air conditioners (when we were there it was 38C-40C outside but inside we were cool), and the wifi was brilliant.
Parking is provided out of town which was fine for us but if you're planning a few day trips outside Florence and need your car it might become a hassle.
All in all, after using Airbnb for nearly 3 months in Italy this is one of the best we have come across.
Would most definitely stay here again.