Stefano's appartment at San Spirito sqaure is a really great place to stay in Florence. All the sightseeing spots and the central train station are reachable by foot, and the Oltrarno district it is in offers a lot in terms of bars and restaurants. Stefano and his assistant Clara are super nice and helpful. The apartment is clean, the bed comfy and it's really nice to have breakfast on the balcony. The internet connection is fast enough for Netflix.
There was only one downside, and I'm not sure what Stefano could do about it: During our stay it rained a lot in Florence, which was accompanied by a foul smell from the wastewater pipes in the bathroom. The smell cleared on dry days. I can thus wholeheartedly recommend to stay here in the summer, but watch out if you'd like to book during a rainy season.