We met Alessandro's friend, Tommaso, the first day we arrived in Florence. He is a great guy and gave us a lot of useful advices on which restaurants/places where to spend great time.
We stayed in the apartment for 3 days. The house was very clean and it is amazingly close to all the city attraction: we never needed to use any kind of transport.
If you are using this home only for sleeping, it's really great, I would rank it 5 stars.

The only bad thing of our stay in the apartment was a problem in the bathroom, causing bad smells. We alerted Alessandro, which never shown up.

A suggestion for the host: a oven would be very useful. The pots were very ruined