We were very happy with our stay at Caterina's. It was really close walking distance to Piazza navona, the Vatican and well..you walk all the way to Colloseum even though your feet hurt at the end of the day. We only saw Caterina once, in 4 days, when she gave us good advice for buses and restaurants in Trastevere. You did not really stay in "her/their apartment", but only in your room, the hallway and bathroom (which were all really nice and clean). Her breakfast corner made it feel almost like a real Bed & Breakfast. =)