My go to restaurant for many reasons:
Food is consistent and delicious. I have tried almost everything on the menu and recommend the burrata, any pizza w/gorgonzola, the rocco salad and the calamari. Drinks, especially wine, are reasonable priced.
I used to be a fairly regular (several times a month) customer at Terroni but I have not gone back there for years. Not only is the pizza at Libretto tastier, you won't find any snootiness about the menu. They are extremely accommodating about allergies and preferences. The front of house service is fantastic. The staff always remember us from previous visits and they are super friendly and helpful. It gets busy sometimes, I just go have a drink at the Crooked Star across the street and Libretto calls when the table is ready. I always feel like they appreciate our business.