We, a family of three, spent a wonderful week in Line's apartment over Easter and were lucky enough to even soak up some sun while relaxing on the balcony. The location of the apartment is great, very central, yet in a quiet, primarily residential area of Frederiksberg: half an hour from the airport with the metro; a few minutes walk from the Forum metro station; and not far from any of the sights if travelling by bicycle (as we chose to do with rental bikes). Line was very helpful and forthcoming with information and check-in/out was easy/uncomplicated. The apartment is clean, comfortable and has everything that you need to feel at home very quickly. A well-stocked supermarket is just around the corner, so we cooked and "stayed in" several evenings after a long day of touring around.
We thoroughly recommend Line's apartment and will definitely return on our next visit to Copenhagen!