Back in Rome for my annual month, I've enjoyed several very good meals (despite my general lack of enthusiam for Rome restaurants) and wanted to report the praise. Felice al Testaccio still serves the best bowl of Cacio e Pepe around, and the service remains a bit off-putting. Armando al Pantheon continues to produce very good food, wonderful service and an authentic mostly-Italians atmosphere right next to one of the great tourist attraction in the City. Bottega Bleve (the current name of the Bleve location in the Ghetto) is stellar. Different from its upscale version near the Pantheon in atmosphere (much less elegant; much more easy-going), it still provides excellent service (Francesco, a transplant from the south by way of Piemonte was truly charming) and a wonderful food and wine experience. Finally, I tried Osteria Fernanda for the first time for lunch. It was warm, cordial, reasonably priced, and delicious. In particular, the Bucatini Amatriciana was incredible--one of the two best, if not the best, I have ever had (and I order it ALOT).
Hope this is helpful