I was at Treffpunkt a few years ago. Was one of only 2 Western guys there....and was in demand! But the selection of guys is quite slim, since it's really small--like a traditional Japanese "cruising house"--one or two stories of cruising space, maybe 2 rooms, like 15-25 guys at a time. Nearly all Cruising Spaces in Japan are like this, as opposed to the 24 Kaikan megaplexes.
Icon, can you tell us more about your visit to 24 Kaikan?
I lived in Japan for 5 years, and had decidedly mixed success at bathhouses there. Thanks!