U4 is definitely one of Vienna's best clubs, having acquired something of a legendary status amongst regular clubbers. The inspiration for its name comes from the underground stop almost in front of the entrance. There are two different floors and a slide-show in addition to the tunes. Each night features a different style of music and attracts a different crowd; drinks are quite reasonably priced. Occasionally live bands play here, and it is open every night until dawn. Saturday nights are the legendary Boogie Nights.
- Open Hours: Monday from 10:00 AM to 04:00 AM, Tuesday to Sunday from 10:00 AM to 05:00 AM
- Type: Open Late
- Accept Credit Card: visa, mastercard
- Nearest Train: Meidlinger Hauptstrasse