Laidback Vienna does have a nightlife, it's just not as frantic as that found in many other European capitals. The city's best bars tend to be in the Innere Stadt (inner city), with a range of venues spanning Irish pubs to designer bars, as well as time-capsule spots from before World War I, with Adolf Loos's American Bar is a prime example. The Copa Cagrana's beach-styled bars serve glorious fruit cocktails.
As far as nightclubs go, the Gurtel area is home to the Rhiz which attracts electronica fans and there are a couple of clubs near Nussdorfer Strasse which offer house music. For the more culturally inclined, many Viennese museums stay open late, with the Albertina and the House of Music being classic choices. Of course, Vienna is a musical city, and operas, ballets, and classical concerts are probably the best options for after dark entertainment.