[mikosty]

As a regular Berlin visitor I have never heard of a club that "forbids alcohol" let alone encourage illicit drug usage. It's actually quite the opposite – the clubs tend to actively discourage drug use (meaning searching for them at the door and kicking out everyone who is caught using).

[pdntspa]

Did you have a local taking you to undergrounds? Because these kinds of places don't really advertise at hostels.