The appartment is very big and light. The airconditioning is a must during the hot summer, and worked perfectly. The location is very nice, very close to the city center and the trainstation Firenze SMN.
What we didn't like is that we found out after booking that Leonardo has lots of different houses, thereby defeating the original idea of AirBnB: renting out your own house. In order to arrive, we had to contact somebody else, who sent us to another person that works for him. This made it feel less personal.
Another thing is that we got each one big and one small towel, while we we're staying four nights. Because it's so hot in summer, we showered twice a day, so this wasn't very hygienic.