It's much darker and older than the photos make it appear to be.
The wifi was unbelieveably slow - I could literally only have one device connected at a time or even one web page loading at a time. It's not a place to stay if you need to work.
It's on the ground floor by the main front door to the building and people were coming and going (and slamming) the door all night - wear earplugs. The main hall light (bright fluorescent) comes on everytime some one comes/goes from the building - so also wear an eyemask.
The bathroom smells (bad drains in Florence) and is mildewy.
Everything felt very tired and worn out, it's okay and seems relatively cheap but once all the extra airB&B charges are added on, per night it didn't feel like good value. I wouldn't stay for more than a couple of nights as it's not really suitable for a long term stay.