Last weekend we had dinner at La Montecarlo. A friend of The Italian recommended it, so we decided to check it out. It's one of those typical places where there are too many people ( also waiting outside), very fast service, not enough space but good food. And -also important- it's cheap.
There were a couple of mistakes made, but they were quickly corrected. The pizza was good - according to the Italian and the Tonnarelli cacio e pepe were very tasty! Also the fritto misto was excellent. If you want to have a quick and good bite to eat without spending too much, this is the place for you. If you want a quiet romantic dinner, you might want to check out another restaurant.
Romantic economical crisis option : you could have dinner at La Montecarlo and then take a walk on Piazza Navona, which is nearby.