This is an amazing apartment. Really close to all of the major sites, we walked across the ponte vecchio everyday. The apartment has been lived in, unlike some 'made for air bnb' flats, so it has all you need for living while you stay. We visited lots of museums, monuments and churches, did a cookery course, cooked and dined out in the four days we spent here, and would happily have stayed longer. The balcony view is phenomenal.
If you're in florence for long enough, get the firenze card - it really helps for avoiding excessive queuing.
Do be aware there are quite a few stairs to get up to the apartment and that you may need bug spray in florence generally.
Abslutely loved the apartment though and Marina was a great host!