I tried to compose a viewable and useful map of Budapest Inner City showing my favourite clubs and bars.
Different signs show:
Purple Dot: Places available at winter-time: not all of them are open in summer as you can find several open-air clubs that are much more pleasant under the warm starry sky - right?!
Green Dot: Places available only in summer: all of them operate in summer ONLY, but what parties at that time...!!! WOW
Red Dot: I signed the Liszt Ferenc Square (Square = Ter in Hunagrian) where you will find dozens of cafés on the same square. Working both in winter and in summer. Of course open-air seats available in summer only, but you either need to go there pretty early or need to book your seats in advance to get one. ALWAYS full of with people and AMAZING Girls! Situated in the heart of the city, almost all clubs available on foot either...
Blue Dot: One of the most breathtaking cafés of Budapest - the Spoon Café & Lounge. Placed on a pretty big boat Spoon has a wonderful view onto the Chain Bridge and the Budavar Caste, both of them are just BEAUTIFUL at night with their lights on. Not the cheapest, but once is worth a try!