In the center of Amsterdam you'll find The Minds which is easily associated with the punk/squat scene.
The best thing about the Minds (apart from the athmosphere) is it's closing time, although it always depends on the owner's ("Dre") mood. Be sure to be in on time because after official closing time the blinds close and you won't make a chance.
They serve dutch beer named Budels which is best consumed from the bottle -not for the taste but it looks cooler and they serve draft in those small shitty glasses.
The Minds is famous for their live bands at Queens Day (30th april).