The Laundromat Café in Elmegade in Nørrebro is definitely worth a visit, especially if you have a backpack full of clothes in need of laundering. Just fill the washing machine with a full load and retire to the bar or café.
If coffee won't do the trick and you're still intensely bored, the café has a wireless hotspot. Games of chess and backgammon and around 4000 books are also available to ease your laundry chores.
The café serves breakfast, brunch, lunch dishes including salads, burgers, sandwiches, dinner plates, a few desserts, coffee, pastries, beer, wine, and various soft drinks.
You can also find The Laundromat Café at Gammel Kongevej 96 on Frederiksberg as well as Århusgade 38 on Østerbro.