I totally recommend to stay at Carolinas and Giacomos Apartment! The Apartment itself is set in a very nice old building in a central area of Rome, you only need 10 minutes by bus to the Colosseum, which starts directly in front of the house. Also it is just a 10 minute walk to the next Metro station. Carolina helped me a lot to plan my stay at Rome by answering all my questions very fast and detailed, and her husband Giacomo was a great host, showing us their lovely apartment and recommending good restaurants to us! I would definitely stay here again.