For carbonara?
"Flavio al Velavevodetto (ristorantevelavevodetto.it) nearly always gets five-star reviews. It’s rightly celebrated for its delicious and traditional cooking, especially its cacio e pepe (pasta with pecorino and black pepper). But, because it’s located on a quiet street on the edge of Testaccio it’s not often stumbled on by tourists (despite its renown). You get the great combination of a local kitchen with local patrons surrounding you."
— The Independent