We had a very nice stay at Roberto's place. The pictures and the description on the site are good and accurate - we loved the outdoor area and ate there whenever we were in the apartment. The kids got a kick out of there being two bathrooms, that was an unusual treat for an Airbnb.
It was a very practical location - the metro station was very convenient, though we were close enough to walk to the Colosseum and other sights. Roberto was very responsive to the couple of questions we had during the stay, and was very kind in holding onto our bags in his shop after checkout.
As other reviewers have noted, the street noise in the mornings can be an issue, but bringing earplugs should solve that.
We would definitely come back again!