I spent 4 days in Copenhagen with my 2 best friends, one of them actually studies and lives in Copenhagen so he hosted us. It was my first time in a Scandinavian nation and the ambiance was cool, you can really feel that feeling of order and of "everything is fine and under control". They were great days, cold and windy, but really great. One of the things that I appreciated most was the Louisiana Museum of Modern Art, I absolutely suggest to visit it, it's outside Copenhagen, 1 hour away but it's reachable easily with the train.