Beatrice's apartment is in a great location, easy walking distance from the main sites and train station, close to multiple high quality restaurants, but without being surrounded by tourists and hotels.
I stayed for 8 nights and was able to explore Florence and a couple of towns in the surrounding area with ease.
Beatrice was a really helpful host - responding to queries promptly when organising the booking, and also while I stayed in the apartment. She also provided some great local intel on local events and public holidays that helped me get the most out of my time in Florence.
If you are arriving from the train station, or get the shuttle bus into Florence from the airport, I would suggest arriving during daylight, as the area around the train station can feel a bit unsafe. Once you are over the bridge though, it is more comfortable.