the appartment was really nice and is located right behing palazzo vecchio. nevertheless, the it was not too noisy. it was clean and everything you need was provided (towels, hair dryer).
what you should consider before booking it, however, is that it is located in the 4th floor which means that you have to take some steps.
unfortunately, the wifi stopped working after the 2nd day and i did not get an answer on my request what to do to fix it.
to sum up, though, it was a really good experiance and i would definitely recommend staying there if you come to florence