Nicola's place was located in Santa Croce. I had my parents stay there a couple days as it was close to my apartment. My parents loved the place! It was super cozy and well near many shops. There is a lot to do around the neighborhood and it is pretty close to the Duomo. The only problem I would say is make sure you can climb a good 3-4 flights because my parents struggled a bit, however, they are older and have bad backs...just a note to be conscious of.
Nicola was very communicative and was readily available if we had any concerns. They had a wonderful holiday. We will definitely book this place again if we are ever in Florence!