We just returned from a 10 night stay at Duccio's apartment. The place is big, clean, bright, updated. We slept well and felt safe there. The kitchen has everything I needed if I decided to prepare a full meal - which I didn't, because the apartment's location is ideal for travellers who are interested in sampling local restaurants.
The location is so good, in fact, that I suggest you overlook the many steps from street level to the apartment! There were several good trattorias, gelaterias and cafes around the apartment. Also, a groceries store, Conad (with a small bakery in it) on the same block and another a block away, just in case.
And you can see the Duomo every time you go outside. And David? Well, he stays at the Accademia, a block and half away from the apartment, on the opposite direction. We walked everywhere from there - including the Mercato Centrale (15 min), a must visit! It now has a new food court on the second floor - amazing.
I definitely recommend the apartment for a great stay in Florence, and Duccio - thank you for the welcome, the quick replies when I had questions, and the overall assistance.