The platonic ideal of a Showa-era izakaya, Donjaca has been serving since 1979 with its original red pleather stools, paper-lantern lighting, and hand-written menus on the wall. The food is equal parts classic and inventive — don't miss the natto gyoza (dumplings stuffed with fermented soy beans) or the mochi gratin. Excellent sake comes in convenient tasting sets. Walk in and you'll instantly feel the warm buzz of old-school Tokyo nightlife.