The Leidseplein is a square in Amsterdam, most visited by lots of drunks and not grumpy old men (or a combination of that). The reason why the old men are not grumpy is because they are buying Marijuana.
Marijuana is together with beer one of the main things that they sell there. It seem to be possible that it's also possible to rent a body in the "backstage area" of a cafe (although the word "pleasure house" is a more to the reality)
So actually it's a average square in Amsterdam