This is my favorite restaurants in the general area of the Washington Conversation Center, and best Potbelly I've ever been in. I am one of their "regulars", and they are consistently good. So I am not baseing this glowing review off of one good experience.
Sandwich was good. They were really fast and friendly.
Great place to grab something to eat before getting back on Metro or going to a Capitals game. Good variety of sandwiches and everything is fresh. Reasonable prices, good service.