We only stayed at Federica and Sonia's apartment for a couple of nights, but it was certainly ideal for what we wanted.
Federica and Sonia are very welcoming hosts and would reply to messages almost immediately. This was very helpful as they answered any questions we had and explained the best way to get to the apartment.
The location of the apartment is only a 2/3 minute walk from Duomo and is literally opposite Academia. It took us only 10 minutes to walk to and from the train station too; so getting around Florence was perfect.
The room itself is very spacious, clean and has a nice welcoming feeling. The communal bathroom, kitchen and dining area, are equally as clean and spacious. Our only concern with the apartment was the temperature of the rooms, particularly the bedroom. The room had a fan, but even with this on, the room temperature was extremely hot.
Overall we had a lovely experience staying in Florence and Federica and Sonia were brilliant hosts who would do anything to help you feel welcomed - we recommend!