This once-synagogue turned chill-out lounge is rather hard to find, ie. there are no signs, ads or an obvious entrance. I stumbled on it by opening the wrong door one night, pulling back a curtain and there was a huge gothic room with vaulted ceilings, DJs, and a bar. Not too over-priced, comfortable, relaxed/dimmed lighting and cool visuals.

Standard events include Friday's "London Calling" and Saturday's "Wicked" as well as various drum and bass parties and somewhat commercial hardcore/punk shows. Things to look out for: [1] the ever-increasing macho, ass-crabbing contingent has caused many to re-consider further visits [2] the bouncers can be ferocious and over-aggressive, which tends to put a stain on an otherwise enjoyable evening [3] drinks are over-priced and the bar-tenders often plain rude [4] Flex is often beyond over-crowded, begging the question of fire-hazards.

I had a coke, my friend had a gin/tonic and the cost was like EUR 12. Their restaurant may be more acceptable - I haven't yet sampled its delicacies. Yellow (bar) has a cold, dark, uncomfortable feel, so if you're looking for an expensive snob option, visit Lutz Bar/Cafe.