Lysiane's place is right where you want to be in Florence, it's about a 7 minute walk to the Duomo which is the centre of everything happening in the city. It's quiet because the room is in the back but as soon as you open the front door you will hear the busy street.
There is a cute cafe across the street, the owners are super friendly but don't speak much English so you can try your Italian!
The downsides are that the apartment is quite damp and laundry takes forever to dry if hung inside and the line outside to dry doesn't get much sun, but besides that it is a great place to stay!
All in all a good apartment right where you want to be!