Now I recommend you one of the best pizzerias in Rome, La Montecarlo, with an acceptable waiting time, an affordable price, a casual atmosphere and of course many locals. It is located near Piazza Navona and you can easily stop by between a busy sightseeing.
「 pasta 」Index
I'm recommending Hostaria Romana to people who are seeking a local atmosphere. They serve traditional Italian cuisine at affordable prices.
I recommend you a small hidden Italian restaurant in Paris. It is a little bit far from the center of Paris, hence I guess not so many tourists know this place.