I had a wonderful time at Paolo's flat. The location is fantastic - right across the street from the Colosseum itself and from the Colosseo metro stop, which gives you access to everything on Metro Line B. Paolo is a very thorough, friendly, and attentive host. He supplied me with all the maps, information, and apartment amenities I could want, and even provided complementary wine and foodstuffs so that I could make breakfasts and dinners at home. The ceilings are pretty low, so I wouldn't recommend this flat for people over, say, 5'8", but for everyone else, I couldn't recommend this place more highly.