Some important things to know:
Firstly, the unit itself is amazing and definitely a 5 star! Very clean and comfortable with all the amenities we needed. An unbeatable location too! The view over the Piazza De La Signoria and the proximity to so many things on our to-do list was just perfect.
To put it simply, everything within the owner's control and about the location is perfect. Our only issues related to the nature of old buildings and having a unit on a busy square. Noise from the hall and outside come through pretty clearly. I'd strongly recommend earplugs and/or white noise if you're a light sleeper. It didn't hurt us at all, but it's the trade-off for all the amazing things in a unit like this! Still a 5 star, just be aware of the noise. :)