During our stay in Florence, we stayed here as it is close to everywhere - Duomo, Mercado San Lorenzo, great restaurants near by and train station - all within walking distances of each other. This apartment is very centrally located. I would have to say, the apartment was clean and big for the 4 of us. Two things about this apartment aside from it being centrally located and clean, there is a bar across the street that gets really loud until very, very late. If you have elderlies or children, it may be difficult for them to sleep at night. The music and the people talking outside can get really loud, and the walls are thin or the window is not soundproof enough. Also, with elderlies, this apartment is not really on the first floor, you would still need to climb two flights of stairs.
Everything else in this apartment is 100%!