Flex has been attracting a more mainstream crowd than it did in its early days but it still manages to retain a semblance of its former edginess, and the title of best club in town. The sound system is without equal in Vienna (some would say Europe), entry price generally reasonable and dress code unheard of. The monthly DJ line-up features local legends and international names, and live acts are commonplace. ‘Messed Up’ on Monday (the night to catch serious techno) and ‘London Calling’ (alternative and indie) on Wednesday and Friday are among the most popular nights. In summer the picnic tables lining the canal overflow with happy partygoers.