We've been fans of Viva Burrito for 19 years. Although we don't live in Boston anymore, we still stop by when in the area to get our Viva Burrito fix. The burritos are SOOO much better than anything offered by Chipotle or other chains. The service is friendly and quick, burritos are HUGE, there are plenty of menu options (well beyond the vast range of burrito options), including some unique offerings. They serve beer, offer a salsa bar, and there's usually soccer on the large screen TV. Nothing better than watching the glorious game while eating your burrito and drinking a cold beer. In warm weather, they have tables and umbrellas out front. Great place to grab a bite before or after an even at the Garden. Great value for your dining dollar!
I loooooove the steak and shrimp burrito. It's kind of expensive for a burrito, but I think it's worth it. They've got a variety that you won't find at any of the chains. Plus they serve beer. The one downside is that the place gets crazy during weekday lunch or before events at the Boston Garden. They're somewhat inefficient and super disorganized. Worth tolerating for the food.