This place is really great: very spacious, great location, very clean and the host was super responsive to all our needs. I totally recommend it for families.
The only thing to keep in mind is that it is located in an old traditional Florence building so the elevator is on the 1st floor (you have to go up one flight of stairs to get to it) and it is really tiny; 1 person and 1 small bag or 1 big bag all alone fit inside it.