I think that detective guy is probably in the dorms in Yoshiwara-- I'm not exactly sure. Dazai might be as well, don't know. But most people end up there to start with.

[Unless you're like Chuuya and tried to pick a fight, so they didn't trust him enough to stick him in a dorm with strangers.]

This place is kind of similar to Japan-- But it's old fashioned in a lot of ways, and weird in others.