My 11yo son is a connoisseur of pizza margherita - he's had it every single day for at least one meal during our recent trip to Rome. In the spirit of providing the most accurate reviews, he has rated each one - I'll post this same review for each restaurant in order of quality.
1) Rosa & Rosae, Trevi Fountain/Pantheon area - Via di Pietra, 88, 00186 Roma
We joined him in pizza here and had one with spicy salami. It was very good, although only three large slices of salami.
2) PastaMore, Trevi area - Via arcione 71b, 00187 Roma
We intended to go to That's Amore - I know, the names are goofy. Instead we opted for this place and had a nice dinner on their patio. Large salad was big enough for 4 to split and the pasta was very fresh. We had linguine w/ clams, and arrabiata. It was nice to choose your own noodle and sauce separately. I wanted gnocchi, but they were out of it.
3) Mattarello, US Embassy area - Viale Liegi 64, 00198 Roma
Our first night in Rome and we wanted something quick and easy next to the Hilton Garden Inn. The pizza was very tasty and hit the spot after a long day of traveling. We also had arrabiata that was tasty with fresh pasta. I ordered gnocchi, but they said it's summer and didn't have it.
3) Luzzi, Coliseum area - Via di San Giovanni in Laterano 88, 00184 Roma
We also ordered a calzone, minestrone and pasta a fagioli here, but they said they weren't making them. All on the menu, but not available. We ended up with lasagna that was okay and I had a capricciosa pizza (mushroom, olive, hard-boiled egg and prosciutto) that was good, but a burnt crust. The thing that killed this place for my son was the burnt crust, gobs, I mean gobs of cheese, and the 20 minute wait. All of us received out food within about 10 minutes -and he sat there watching us eat. The waiter didn't care - it was pretty sad. The pizza that did come came with gobs of cheese that wasn't fully melted. He had a couple slices, but we ended up with more than half wasted. We choose this specific place because of the other positive reviews. What a shame. BTW - they only serve gnocchi on Thursday, so no luck for me again! read more