FANTASTIC location. We actually didn't realize how close we were to everything.. Campo de Fiori, Palazzo Farnese, Piazza Navona.
Campo de Fiori has tons of restaurants and bars within one minute from the apartment. However, the apartment faces an opposite side so it's very quiet.
As others have said, you can hear the neighbors leave their apartment and walk around. It gets quite loud at times but only happens 1-2 times a day.
There is a washer here but it is in a locked closet in the hallway outside the apartment.
Overall a great stay. Would recommend just for the location alone.
PS.. it IS four floors up so be prepared to walk.