This experience was certainly one of my best with airbnb to date.
The view of the Duomo looks even better in person than it does in the photos. The apartment is clean and modern, but still has a rustic Firenze feel.
Cristina left us a thorough booklet of suggestions and information about our stay and about what to do in Florence. It was really thoughtful and we definitely took advantage of her restaurant recommendations.
The location is perfect. With that being said, it should be noted that it is a little noisy, especially on the weekend nights. Since the apartment is "where the action is," it is definitely isn't quiet/secluded.
I would stay here again in a heartbeat. The value, the view, the location, and the amenities are all top notch.