Kitzy; Get a copy of the latest Frommer's Rome. Make sure it's recent; 2006 if you can find it. Their restaurant recommendations are good and pretty accurate. As was inferred, many of the good restaurants close, or go on shorter hours, in the summer. Many of the natives get out of the city in the summer. At other times of the year you must have reservations, or you won't get in the better places. We tried three days ahead for a La Pergola dinner reservation in late Oct and couldn't get in. L'Altro Mastai would be a great pick if you can get in. Passeto is very good food and a lot of fun.