The location of this hostel is AMAZING. We only stayed one night in Florence, and it was really worth being in the city center. It was small, cramped, and kind of dinky. My main complaint is that there was only one bathroom in the part of the hostel where we were staying, and it was horrible. The door didn't shut all the way, which is a problem when showering. And you had to push the button on the toilet 30 times before it would flush.
Worth it for one or two nights, but if you're staying longer, look for somewhere nicer.