My mom and I stayed here for our first trip to Florence and it was just what we were looking for. Walking distance from the train station, right around the corner from Santa Maria Novella church, walking distance from everything we wanted to see and in a quiet and safe side street with nearby shops and restaurants.
There is one flight of stairs, which are a little uneven so if you're not able to climb any stairs, this may not be the place for you but it was fine for me (in my 40's) and my mom (60's). There is a secure door to the building, another secure door to a shared entry room and another secure door to the unit. Other folks might be in the adjoining apartments while you're there but we didn't hear any loud noises from the other unit or the street. The air conditioning was great so that we could keep it cool and quiet at night and the wifi was good. The bed was comfortable enough and there were plenty of extra blankets and pillows if we wanted them (we didn't use them). It was convenient to have a kitchen for morning coffee, it was well equipped with dishes, utensils and pans, there was a fridge, induction stove, washer with a drying rack you could put out on the balcony (for U.S. folks the washer takes a long time and is small compared to what we were used to, but works great) and be sure you know how to use a Moka pot for coffee (which was standard in every Italian apartment we stayed in).
The bathroom was modern, updated and spacious. It was a little odd in that the shower is separate and directly off the bedroom, but that also let us get ready at the same time so was very convenient. The place was beautifully and comfortably decorated with all of the basics covered.
The best part of our stay, however, were our hosts. I was mostly in touch with Francy via Airbnb to coordinate check in and she was responsive and flexible. We were arriving via train from Venice, with a short stop in Pisa, so timing was tricky but Michele was there soon after we arrived at the apartment and found us. He gave us the full explanation, was so friendly and helpful and sent us a list of nearby grocery stores, restaurants, and explained about many typical things in Italy. Our favorite recommended places were La Boite for breakfast (espresso and pastry), Antico Ristoro del Cambi for our first dinner in Florence, Trattoria da Marione for another dinner but we couldn't find Rivalta for dinner and drinks near the river.
I would definitely stay here again, recommend it to friends and stay anywhere managed by the friendly and professional team of Margherita, Michele and Francy.