As the other reviewers have mentioned, you can definitely hear the noise from the piazza below throughout the day and night. So if you have someone sleeping on the sleeper sofa like I did, it might be an issue for some. I quickly became used to the noise though. My travel partner, who slept in the bedroom, didn't hear nearly as much as I did and slept peacefully.
The living room has these wonderful metal sliding screens that blocked out light extremely well even during afternoon naps. The sofa sleeper was quite comfortable too - like surprisingly comfortable.
Do not let the street noise detract you from this apartment though since the location and the amenities far outweighs it. You can easily walk to a lot of sights within 20 minutes from this apartment. There are plentiful restaurant, shopping, or grocery need options nearby as well.
Marzio was very communicative and friendly and was able to help us with early check-in. I'd definitely stay here again.