Our family of 4 (2 teenagers) stayed at Claudia's apartment for 4 nights. The apartment is in a very central location, by the Mercato market and close to all attractions, and under 10 min. walk from the train station. We did not need to use transit during the entire visit in Florence.
The apartment is very clean, bed is comfortable, shower stall is good size.
Note that the apartment is on the top floor with no elevator and one of the beds is in the loft with steep staircase, so it might not be suitable for everyone. However it was fine for us.
Claudia is very responsive and efficient. We had a great time.