London Times suggestion

17 Da Augusto, Rome
Rome has wonderful high-end dining experiences — it’s one of the few capital cities to have retained its culinary heritage. But, as the Romans say, “The more you spend, the worse you eat”, so, for a truly authentic experience, have lunch at a trattoria such as Da Augusto, in Trastevere, where the food is as straightforward as, say, spaghetti cacio e pepe (spaghetti with cheese and pepper) or the even simpler spaghetti aglio e olio (pasta with olive oil and garlic).
Piazza dei Renzi 15, Via Della Pelliccia; closed Saturday evening and Sunday; no reservations or credit cards; mains from £6; 00 39 06 580 3798, no website