I've had a great time staying at Monia's : she was both very welcoming and helpful. Thanks to her recommandations for instance I've had dinner in nice places in Florence. And I was glad we could have a little chat together from time to time.
The apartment is not right in the city center but you dont have to worry as the ride is rather quick and safe : I made it by walking, always, though you can do it by bus very conveniently as well.