Even though we never got to meet her, Nadia was a very helpful and gracious host. Her associate, Lilliana, welcomed us and showed us around the apartment as well as giving us a few helpful tips. Even though she didn't speak English and our Italian is a bit limited, we managed to understand one another.
The apartment was super-clean and just as shown in the pictures. Since it is off of a busy street, there is a little bit of traffic noise, but nothing that was a bother to us. Since we drove to Florence, we opted to pay the extra 10€/day to use the garage. It was an extremely tight fit for our mid-sized SUV, so bring a small car if you are planning on using it.
The beds were comfortable, the shower nice and hot, and the air conditioning nice and cold (great after trudging around the city in 34°C heat all day)! We ate dinner both nights at a restaurant that she recommended (and left 10% discount cards for) and really enjoyed it. There's also a nice little bar/caffeteria just a block away to grab a good breakfast/lunch.
Overall a great stay!