Great place: for return and first timer.
Location is a 10+. Walking distance to everywhere. Forum and colosseum are right next the flat. Easy 5-10 min walk to Nanova, Trevi and shipping street. 1.5 miles from the Vatican City: walk or easy bus right outside the Flat. Good local restaurants with 4+ stars on TripAdvisor are in every corners. The place is clean and the owner is very friendly and willing to help along the way.