This was the best Airbnb we stayed in during our 10 days in Italy (we stayed in 4 different cities).
First of all -- the location is amazing. You walk out of the train station, cross the street, and you're there.
2. Raffele was incredibly incredibly responsive in the Airbnb application even though we both didn't speak the same language (hat tip to Airbnb for doing in-message translation on the fly!). We were used to cooler temperatures when sleeping so he got his technician to turn on air conditioning the very next day (usually AC is turned on May 1st, when it's needed in Florence because of the temperatures).
3. his was the only Airbnb we stayed in that actually had new, big water bottles and house slippers ready for us to use. A really nice touch.
4. The Airbnb itself is super new and very very modern when it comes to design. It was nice having 2 bathrooms for my wife and I to use.
The only thing to note is that the Airbnb is located in a busy area of Florence so there are random noises throughout the day and night you will hear (e.g. the local buses and trains). So if you're a light sleeper, definitely get some ear plugs or play some music.