I had a wonderful stay at Flavio's. Flavio himself is extremely kind and accommodating, and the apartment is lovely and very clean. The location -- the beautiful Aventine -- is lush and peaceful, close to lots of pleasant restaurants and bars and walking distance from numerous major attractions (the Forum, Palatine, and Colosseum, the Capitoline, the Baths of Caracalla, and the Basilica of Santa Sabina and Giardano degli Arcani, etc). It's also under ten minutes from the metro. I would absolutely stay here again :)