The apartment is really close to the Vatican, the distance is entirely walkable, although only if you're young and fit - vigorous up-and-down 20-minute meandering route will bring you to St. Peter's Square. Underground station nearby is a real advantage. The idea of sharing a bathroom with another roomful of guests is not a happy one, but I can't say I didn't know about it in advance). I wouldn't call the apartment particularly quiet, because it's a B&B with 3 rooms to let, but it was definitely clean and otherwise well-maintained.