Rosi' apartment is a great play to stay and to discover Florence. The apartment is spacious, clean and has everything you need. Also Rosi is a great host, whom you can ask everything you need.
The neighborhood has several small shops where you can buy fresh bread and fruit to take into the city. Walking into the city takes about 15-20 minutes and walking to for example the Uffizi takes you 35-40 minutes.
All in all Rosi' apartment is a great place to stay if you want to visit Florence.