On a scale of 1-5 I would give this place a 10+. Carlo, Paolo and Arianna were great hosts. They created a warm and welcoming atmosphere with great info. on area restaurants and sites nearby.
The apartment itself is totally renovated with everything brand new. The apt. is only a 10 min. walk to the San Giovanni metro stop and within walking distance to the Colosseum, the Baths of Caracalla and San Giovanni Laterno Church. There are restaurants, shopping and supermarkets nearby. I could not recommend this place anymore highly.