I wanted to recommend LA GATTA MANGIONA. This off-the-beaten-path restaurant is some of the best pizza I've eaten in Rome (and I've eaten FAR too many pizzas for FAR too many years). The restaurant is located in Monteverde on 30 Via Ozanam (accessible by Tram 8 which departs from Largo Argentina...you'd have to get off at Piazza San Giovanni di Dio) and they are only open for dinner. I ate the Parmigiano pizza--eggplant, tomato, mozzarella and parmigiano, and it was superb. My friend ate the Rustico pizza, which consisted of tomato, oregano, pecorino and onions...and while it sounds unusual, it was crispy and had just the right blend of tart (onions) and tangy (pecorino) and spice (oregano); this is what I'll be eating the next time round. What most fascinated me about the creative and extensive menu (not in English) were the pizzas that are made with wine. There was a white-wine-margarita pizza, which seemed especially appealing, and curious (maybe on round 3)...though it one of the was priciest pizzas on the menu (14). The dessert list, too, was extensive and homemade; extremely appealing was a dark chocolate pudding (which was finished by the time we ordered...11:15 PM). I must admit that the service left something to be desired, but I was impressed by the fact that they had a sommelier on duty for both beer and wine selections, and everyone was very polite (albeit SLOW and overwhelmed).
A fantastic meal and well worth every centesimo. Reservations are necessary +39 06 534 6702