Corvintető is a club atop department store, famous for its spacious rooftop bar with great view of the city. In winter, when the open air terrace is closed, you can dance and chill till dawn downstairs with DJs and cool crowd. To get to Corvintető you can use stairs or an old elevator with a minibar.
VIII. Blaha Lujza tér 1-2 (Corvin Department Store)
Open: 18:00-05:00 daily
Link to website
Places in Budapest