My boyfriend and I stayed at Francesca's place during our time in Florence and we absolutely LOVED it.
The location was fantastic, located on a side street right off Piazza della Signoria and right by lots of restaurants, bars and shops. It's centralized so it's very easy to walk to all the sites (including the Duomo which we passed every day/night to get home)!
The apartment itself is also very charming and functional. We loved the loft feel and it's unique architecture and style.
Given the chance, I would definitely stay here again and recommend it to any of my friends who are looking to stay in Florence.