I lived in Rome for 3 years and have searched high and low for a good pizza restaurant since moving back to the States. Settebello is the real thing. I feel like I'm back in Italy when I have their pizza. Absolutely fresh high quality ingredients and the types of pizza they make are hard to find elsewhere.
Friendly staff, service is usually excellent, but can be slow when it's packed. The restaurant can get noisy so don't expect a quiet romantic setting. I especially like that I can use my Italian when chatting with some of the staff.
I highly recommend Settebello.