In Rome, two of my favotire restaurants were
Hostaria la Botticella and
Vecchia Roma. The latter serves the best version of Bucatini Amatriciana which is a signature Roman pasta dish. Both are fantastic and inexpensive. I only had one meal that was "meh" in Rome and I was there for a full week so generally speaking, it's tough to go wrong - the two mentioned above were just the standouts.