Tonnarello is a lively, casual trattoria in Trastevere known for generous plates of fresh tonnarelli pasta, especially the carbonara and amatriciana, so plan to order one of those. Expect reasonable prices, roughly €10 to €15 for a pasta main, and a noisy, convivial atmosphere rather than a quiet meal. It gets busy for dinner, so book if you can or show up early to avoid a long wait; service is informal and quick. Bring some cash just in case, though cards are usually accepted, and come hungry — portions are hearty.