One of the city's various artist-run cultural institutions, Kunstnernes Hus is set in a spectacular 1929 functionalist building with a broad terrace overlooking the green of Slottsparken. It's a supremely laid-back and scenic place to have a spritz, wine or beer; the crowd is an interesting mix of the city's creatives; and there are always excellent tunes playing on the decks.
There's also a program of occasional exhibitions and lectures, and it has a number of artist studios. The pizza is good too.