We stayed at this apartment for a week in August and could not be more satisfied with it. Irene was an excellent host and stayed on top of communication with us leading up to the stay. The apartment was very clean and comfortable, with two good sized bedrooms and kitchen/dining area. The view was amazing, with Il Duomo right outside. We would love to stay here again if our future plans take us back to Florence, which I'm guessing they will.
Two things to note, you have to climb about 8 flights of stairs to get to the apartment, and if you are a late or light sleeper the duomo's bell tower starts chiming at 7AM. We are usually awake before then so it was never a problem. Aside from that the apartment is very quiet even though it's located on a busy street.