I would like to thank Sabrina for her help and speedy responses to questions. The apartment is as described, 4 large bedrooms with very comfortable beds, well located near the Vatican and a 15 minute walk to the nearest Metro station.
We're not sure of the full story but the owners restaurant is no longer next door (we believe it changed in November 17). We did dine at Lab 30, as it's now called, good food and very friendly staff, would recommend a visit.
The only negative comments regarding the apartment would be that it needs some TLC and the neighbours in the above apartment need to find the volume control for their TV (we appreciate this is not directly related to the apartment and for the time we were there didn't cause problems).