My wife and I stayed here as leg two of our month long honeymoon.
Sabrina, and her son Alessio were the most wonderful hosts, with Alessio meeting us at the train station, taking us to the flat, showing us points of interest (and the good local restaurants) along the way.
The flat itself is better than described. Well appointed, comfortable and stylish. The neighbourhood is close to the city centre but quiet.
This is by far the best Airbnb We've stayed in, and we would have no hesitation in recommending it to other travellers (indeed We've already mentioned it to a friend who's travelling to Florence soon).