I visited Salvatore's apartments for 4 days over NYE. Communication by the host was excellent before and during our stay - Salvatore is very quick to respond to any questions asked of him. On arrival we had been left a hamper of goods - unexpected but very kind! The bedrooms and bathrooms were all very clean and key essentials available.
On leaving the main entrance of the building the coliseum is visible at the end of the road - the proximity is incredible! It was a great place for me and my group to walk into the city centre from and see all the sights. The local bus stop is also a two minute walk from the main entrance.
A few minor points:
1) For large groups everyone needs to be speedy in the showers so the hot water does not run out.
2) There was a funny odour some mornings in the smaller apartment but this did fade.
I'd recommend Salvatores residence and certainly use it again if returning to Rome.