Historical sento that is listed as a tangible cultural asset by the Japanese government. You can feel the history in this place. If you go to one sento in your life, Gengabashi would be a great option. Check out the Statue of Liberty on the roof. That's because "New York" sounds like "Nyuyoku" or in kanji "入浴" meaning "to take a bath."
Update Winter 2019: Temporarily closed for a extended period of time. So sad. I hope it opens again soon. Check the Osaka Sento Association webpage above for more current information.