We had a very good time at Rosa's apartment. It was clean and practical, and easy to find, and Rosa is a very nice host. The area of Trastevere is very lively and busy during the night, so it is very good that the all the windows of the apartment are towards the backyard. It was some noise during the night, partly due to a restaurant in the first floor - (not noise from guests, but perhaps from the kitchen), and partly from other apartments in the backyard. If you sleep with open windows, ear plugs are recommended :-) If one knows Trastevere, and Via della Scala, it was however not more noise than expected.