I stayed with three friends in Karoline and Mikkel's place and we have nothing negative to say about our stay. The apartment is quaint, functional and in a cool and central area of Copenhagen. We had no problems with finding the apartment, or extra questions regarding anything, so we weren't in close contact with Karoline and Mikkel during our stay, but the communication before the stay, at check in and check out was good. The hosts had also very kindly provided us with maps of the city, the area of the apartment and personal recommendations on restaurants and bars for us to spend our autumn nights at.
All in all a fabulous stay. 10/10 would recommend!