Blågårdsgade at Nørrebro is one of my favourite places in Copenhagen. There are some really nice shops and cafés and generally a really good vibe.
Mayol is a cute little shop with girly things for your home. The café/bar next to Mayol, Props Coffee Shop is the place you go when you need a beer or a cup of coffee combined with a long talk with your best friend, a new friend or just the paper. All of the furniture is second hand, which gives a nice feeling to the place.
Harbo Bar is a rather new café at Blågårdsgade, but there are no problems getting customers when you've got good coffee, warm apple cider and nice bartenders.
Café N (as in Nørrebro) serves cheap, well-tasting vegetarian food - and it's a nice place too! It's a small place, but people are already starting to sit outside.