DC is limited on good sandwich places, but here are the musts:

-A Littieri on Morse NE next to Union Market (don't order their Italian, ad hoc your own sandwich to your liking as otherwise the Italian is rather bland if you ask me).

-Salumeria in Brookland (go Mondays as their bread seems the most fresh then, also needs some of your guidance but nonetheless pretty good)

-Bub and Pops on M/Dupont: huge ass sandwiches, but they're pretty good even if you want to eat leftover sandwiches the rest of the week.

-Stachowski's in G-Town: if you can tolerate G-Town I highly recommend this place. Just hell getting there if you ride a bike, take transit, or drive.

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Some people have mentioned Carl's Subbs. They're worth a visit too (bring cash), but I'd stop at all these above, first.

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Prepare to be underwhelmed if you're a sandwich connoisseur, though- sorry. DC just doesn't have anything close to what you'd find in NYC, Philly, Portland, NO, Toronto, etc.