The host Federico was very nice and welcoming. He gave us a map and recommended several restaurants etc. There is a supermarket about 5 minutes walk which is well stocked for those who wish to self cater. The apartment is located on the outskirts of the city in a nice peaceful area during the day, and only a short level walk alongside the river Arno to the city centre. It is on the first floor (so expect several stone stairs to climb) in an old building with other apartments, and very secure from the street. It's clean, bright and very spacious, with everything you need. The french doors in the kitchen and lounge open onto a small balcony, which overlooks other apartments and a central courtyard.
The only negative for us were noises at night from people and traffic going past in the street below (the windows are only single glazed and the shutters don't close tightly so you can't block it out) and although marble floors big windows and high ceilings are lovely, they make every sound carry. You can easily hear other residents shutting and locking their doors etc.
Overall this is a great apartment, and if you are a heavy sleeper, we recommend it.