This apartment is beautiful! Costanza is a wonderful host and there are many, many amenities and little touches that make this space special, as well as plenty of space for our group of 4 (three adults and a teen). The fridge and pantry were stocked with food and supplies and just about anything you need to use the space is there - umbrellas, walking stick, rolling cart for the market, tourist info, restaurant suggestions, etc. She's thought o everything! We had an issue with the hot water the first day that was handled immediately - very responsive and attentive.
The apartment is convenient to everything without being right in the middle of it. It's about a 12-15 minute walk to the Duomo and many restaurants and stores are within a few blocks. We had a car that we parked in a nearby garage outside of the ZTL, about a 10-minute walk, 70 Euros for the week.
In March 2019 there was a lot of construction in adjoining buildings. The work starts around 7 am and continues until 6 pm. I did not find it bothersome but others in my group did. The only issue I had with the place is that there were many kinds of very strong-smelling perfumes, like air fresheners and fabric spray. The couch and drapes were heavily perfumed and I couldn't sit on the couch or spend much time in the living room because of the flowery smell. I moved the room fresheners outside to the terrace during our stay but the place still had a very strong smell.
Overall I would highly recommend Costanza's apartment and her hospitality. We enjoyed our week in Florence very much!