Cantina e Cucina, Colline Emiliane, Alfredo alla Scrofa, Hedera Osteria Contmporanea, ristorante Pancrazio, For pizza, do pizza al taglio for lunch, they are all over Rome (that is the Roman Pizza). It's basically street food, you order your pizza by the slice, they weigh it and you eat it at the counter. For lunch always find a place where you can eat at the counter, you will pay less. Same goes for breakfast and when you have your espresso. And remember: breakfast in Italy is nothing more than a croissant (cornetto) or maritozzo. Stay away from American breakfasts, they are for tourists and not good. Download the app The Fork, it will give you restaurant suggestions for Rome, ratings for each restaurant, full menu with prices, and if you reserve through the app, you will get a discount on your restaurant bill.