My family of four (myself, wife, two kids aged 7 & 9) had an excellent stay at Shelby and Nicco's place. Highly recommended.
1) Before arrival & arrival: Communication was great. As we were traveling, it was helpful that Nicco reached out several times to make sure he had the correct arrival details. They were waiting for us at the apartment for a very warm welcome. We had such a good time chatting that our kids afterwards thought we were old friends. Details of the apartment were clearly communicated and very nice recommendations were provided in the apartment. Very easy checkin.
2) Apartment: The apartment exceeded our expectations. It was a beautiful fusion of modern and classical that was very nice to our taste. There was plenty of space to stretch out and relax, and the apartment was very clean. The fifteenth century refinished chapel off the master bedroom was a work of art; nice that it could be seen from the street below, sparking conversation with pedestrians! Only problem is the kids didn't want to leave the apartment ;)
3) Location: Our first time in Florence, so the apartment seemed to be in an excellent location. We walked everywhere from the apartment within minutes. While The main streets of Florence were very busy and loud -- and even many of the side streets were as well -- Nicco and Shelby's apartment was on a quieter side street that had very little ambient street noise.
4) During stay and checkout: Checkout was very easy, with clear instructions written and reminder of instruction on day before departure. Also there were a few checkins during the stay to make sure everything was going well.
We have stayed in a half dozen Airbnb's, and this was our best experience. Pricing was a bit higher than other experiences, but for the location, quality, and cleanliness, it was well worth it.