I echo the stellar reviews that others have written here. The place is located in the Oltrarno section of Florence, a hip neighborhood with lots of restaurants and shopping, yet quiet at might and within easy walking distance of all the sites of Florence.
The space itself is absolutely fantastic--a medieval tower with a fantastic view and all the comforts of home. It also has a fast wifi connection, good water pressure, a washing machine, Nespresso and Netflix.
Alfredo and his assistant Maurizio are extremely responsive. They have also thought of everything--right down to a phone that has phone numbers programed directly to them and Taxi service to the train station.
I cannot wait to stay there again the next time I am in Florence.