Great location, just as described. Very near to one of the bridges which made getting around Florence very convenient, but still on a quiet street.
Be sure to plan on humidity though, as the bedroom is underground. It might have also been affected by the small bit of rain the city got while we were there, but it felt very damp in the bedroom which was not very comfortable for sleeping. The flat in general though was very comfortable, and a great value.
Raul was also great, as he met us at check in and gave us great tips for our time in the city.