My parents will be in Rome in a few weeks. They like good food, but are not very extravagant and tend to eat pretty lightly. They are looking for recommendations for about 4-5 nice restaurants that are serve simple, basic fare and are average to moderately priced by Rome standards. (I would be more specific about price, but I don't know what a decent meals cost in Rome right now.) My dad speaks Italian, so mom-and-pop places where language might be a barrier would not be a problem. They are not looking for elaborate meals and definitely want to avoid tourist traps.
Any help would be greatly appreciated.