We (a group of four friends) visited this place for a bite to eat after a visit to the Vatican just across the bridge from the castle. It's a small, intimate place however we were able to sit at a large table and share it with another solo traveller.
The food is superb. We initially opted for a medium salami board and a small porchetta board accompanied by a bottle of wine. The food came out on large wooden platters, full of various salami, ham, bresaola, cheese, bread, pickles etc and the porchetta platter came out piled high with thick slices of incredible porchetta, cheese and bread. Three more bottles of wine and another meat platter later we reluctantly dragged ourselves out of there to continue our sightseeing. This was one of the best meals we had in Rome which is pretty good going considering the high quality meals we had at other times.
My only criticism would be the use of plastic cutlery and plates. Whilst most of the food was eaten with our hands I hate using plastic cutlery and plates and in this age where our use of plastic should be curtailed it seems very wasteful and not appealing.