The location of this apartment is the best feature of it. It's located right next to the market, so if you're interested in somewhere that's close to everything, this might be the place for you.
Unfortunately, the rest of this apartment did not live up to our expectations. We had booked this apartment with 6 guests, but arrived with 5. There is no way this apartment can sleep 6, as even with 5 we were uncomfortable. As other reviewers have mentioned, you have to walk up several flights of steep and dark (and wet... the ceiling was dripping the entire time) stairs to get to this attic of an apartment.
On our second night, we walked back up to the apartment to find that one of the neighbors downstairs' apartments was missing their door. After we entered our space, we heard loud banging and screaming coming from downstairs that lasted for at least an hour, and we could hear every word (I have a recording that was taken from the living room of our apartment. It is unpleasant).
Communication with Roberto was difficult. I'm sure part of this has to do with a language barrier, so I don't blame him for that, but unfortunately he told us we were breaking the law by using the heater even though it was FREEZING (and was unable to provide any actual information about the law; I did some extensive research and was unable to find anything that was nearly as dramatic as he made it seem), he didn't know much about using keesy to store bags (instructing us to reach out to their operator instead), and claimed that he had provided me with information previously about using keesy that did not exist.
Unfortunately, our stay at this apartment did have a slight damper on our feelings towards Florence. If it had just been two people I wouldn't have minded as much, but we were with my family; my mother has decreased mobility, and my father was ill for most of our stay in Florence (so the absolutely frigid apartment did not help).
All in all, if you have fewer people than we did, want an amazing location, and are unbothered by what I've described above, go for it! I think we perhaps just had too high of expectations. This apartment is by no means the worst of them :)