Staying at Massimo's place was a great adventure. The apartment is tiny but there is everyhing you might need when visiting Firenze (coffee, tea, coffe machine, electric cooker etc).
It is very stylish, with bricks on the walls and a bed on mezzanine.
The apartment is situated really close to the Duomo, but far enough from the most touristic places to give you the taste of the real Firenze. There are a lot of bars and restaurants in the nearest surrounding so you can really have a taste of the local spirit.
Also, Massimo is a very friendly and caring host - I totally recommend staying at his place!
Tha