The host was very welcoming and helpful. The neighborhood is great because it is close to Vatican, Saint Angelo castle, a metro station, and has many shops and cafes nearby. The only problem with location was that outside the house it was rather dirty. The house itself is nice and clean. The apartment is spacious and also clean. The tiled floors are not too comfy when it is cold, but should be OK in warmer seasons. The bedrooms are well-equipped, with nice mattresses, bed linens, and towels. The kitchen also had everything we needed (except for a microwave, but it seems to be a rare amenity in Italy). The heating was strong enough to keep us comfortable during the winter nights in Rome.
Side note: The apartment was a bit overpriced due to a pre-NY last-minute booking, but in normal days it looks reasonably priced.