You're likely to spend some time soaking in a Japanese bathhouse; eating in one is a different story. Maisen was converted from a former sento (public bathhouse) in 1983, and you'll find the old high ceiling, characteristic of bathing rooms built during the first quarter of the 20th century, as well as the original signs instructing bathers where to change. Large bouquets of seasonal flowers help transform the large, airy space into a pleasant dining room. Tonkatsu (deep-fried pork cutlets) is Maisen's chef d'oeuvre. Though it's more expensive than the regular tonkatsu roast, consider trying kuroi buta no hire (fillet of Chinese black pork), which is very juicy and tender. There are no-smoking rooms upstairs. Subway: Ginza, Chiyoda, and Hanzo-mon lines, Omotesando Eki (Exit A2).