My wife and two adult children spent four nights at the apartment. It was well furnished. We had intended to cook thanksgiving dinner in the apartment but the restaurant in the building did thanksgiving diner so we only eat breakfast in the apartment.
Everything worked fine. The bedrooms were large, the bathrooms were very nice overall there isn't a bad thing to say.
You do need to climb four flights of stairs so you need to be in ok shape. That was tough after spending hours walking around Florence but it gave us an extra excuse to have gelato.