We stayed at Karen's apartment for four days.
The place is perfect for two people, Karen was extremely kind and flexible with both check-in and check-out.
From the apartment you can take several buses that will get you to city centre in 10-15 minutes, the closest subway station is at 12-15 minutes on foot (1 km) and is only one stop away from Copenaghen Central Station. However we walked most of the time: city centre is at 2km from Karen's house so, if you like to walk you can reach it in 30 minutes more or less.
Karen's house was clean, cosy and warm, exactly as the pictures. Near the apartment there are two supermarkets and plenty of cafes.
Will definitely return there next time :)