My family of 5 had a great stay at Tarcisio's apartment. We stayed there during a very hot part of the year (August 2013) and loved that it had air conditioning! It was much needed since we spent much of our time walking around in the heat.
The apartment is very spacious, more than it seems from the photos. We slept 3 to the bedroom (2 in the big bed and 1 in the twin) and 2 in the sofa bed in the living room. It was very comfortable and clean with all the amenities easily available and accessible.
Tarcisio was an amazing host. He met us at the apartment just as we arrived and answered all my messages right away. He is very passionate about his apartments and Florence and he gave us great restaurant and cafe recommendations in the area. He was so animated, excited, and helpful, even letting us print out a museum reservation confirmation using his personal printer.
In terms of location, it was great. About a 15-min walk to the town center and close to two amazing gelato places on the way! There was also a huge supermarket a 5-min walk away where we bought food to cook our lunches.
I would highly recommend this apartment.