Valerio and Sara's place is a great little apartment just a short walk from all the main sites of Firenze. We were a couple and a dog with our friend and in three we slept very comfortably in the flat. There is a double bed and a single bed in the bedroom and a double sofa bed in the living room so you could sleep up to five if you don't mind sharing beds.
The flat has all the things that you will need for your stay and Sara and Valerio are very helpful but also respectful of their guests privacy I would definitely recommend it to other Air BnB users!