We stayed two days in Florence and were warmly welcomed by Marella. She gave us and introduction to the apartment (incl. recommendations where to eat and do sightseeing etc.) and also left a delicious bottle of wine for us. The apartment is in a central location and in walking distance to a lot of sights e.g. Uffizi Gallery. The apartment was a little bit noisy at night, but we knew that already from other reviews and brought our ear plugs (which I recommend you do).
Overall, we enjoyed our stay and Marella's hospitality. We would be happy to stay there again if we should come back to Florence.