we recently stayed in Sylvie's place during our trip to Florence. The communication with the host was fast and efficient. She even let us have an earl check in which was rather kind of her.
The apartment was basic and clean, small functional kitchenette with basic utilities.The bathroom was small but renovated. The airconditioning worked great.
However we were not happy with the location. It was quite out of way from the city center. You had to take a tram first and then walk for another ten minutes to reach the apartment. Although the host mentioned this, but once there, we did not like the location and idea of taking the tram ( especially with the luggage it was a night mare).
Also the area did not feel very safe to walk back during the evenings.
IF you are fine with the slightly off location then definitely book the apartment as the host is a great lady and the apartment is also quite decent.