I had a great experience staying at Mauro's place. He is a wonderful host. He gives you a lot of recomendations, has a folder with all the info you may need, places to eat, events to go in the evening, free places to visit.
The flat is wonderful, everything is in place, the decoration (with his grandmothers furniture) is lovely but also very well organized. You have your own labeled shelf in the fridge and in the cupboard and he cares about all the little details. When I arrived I had a beautiful platter in my room with cantuccini (tuscan biscotti).
The place is not in the city center but very near, so you live in real Firenze but are close to everything. Sometimes, when you walked all day, the 20 min walk from the center gets a bit tiring, but you'll never find a place like this, for this money, in the city center. And if you, like me, want to travel to different Tuscan villages every day, it is really close to the train station, so that's great.
I would definitely stay there again and I would recommend it to everyone!