The apartment is really lovely - even nicer than it appears in the pictures. It's light, spacious, and beautifully furnished and designed. Particular highlights were the piano, CD player and phone/ipod hookup (you have excellent taste in music!), and comfortable (and big) bed.
The host was in communication and arranged for us to collect the keys from a friend nearby as she was away that weekend. She also kindly allowed us to check out later and offered to let us leave our luggage in the apartment.
The apartment is a little further out, but it's only 15 minutes to walk to the nice areas of Norrebro and you can get transport very easily from nearby. The apartment is also spacious and much lovelier than you might get closer in to the city.
I'd fully recommend Katrine's place and I'd definitely try and book again for a future trip to Copenhagen!