The location is super convenient. Close to many major attractions. Although it's very close to Fontana di Trevi, you will not hear anything. I slept like a baby. If you're planning to take pictures alone at the fountain, give up, there is always people. However, if a handful of people won't bother you, try very early in the morning or very late at night. For both options, I would recommend staying at Marzia's place.