I had a very pleasant stay with my mum in Gianfranco's flat. Wemet on the first day and he was more than willing to help us. However, we didn't really need it because everything went well.
The flat is very nice and has lots of room. It is quite near the town centre by car/bus (more or less a 10 minute ride). There is also a big supermarket a few meters away.
I can't really think of anything bad to say about this. I will definitely rent this flat again if I ever come back to Firenze!