I am not from that area and only do shopping during the day. Never had any problems walking down from the convention center towards Chinatown. Highly recommend getting one of the folding maps they sell in one of the drug stores (maybe Wallgreens?). They have indicators for the train stops on those maps too. A decent compass is not a bad idea, either.
Have been going to DC since Otakon moved there and only found the 2nd Dunkin Donuts this year. When waiting to check out from Otakon 2022, I noticed some courtesy printouts of the local restaurant locations at the Concierge desk. Will have to