I can warmly recommend Karen's place to everyone! The communication was easy with her. Her place is amazing and just next to the metro station where you can easily reach the city center. I stayed with 3 of my friends and for us it was a perfect place to stay. Amager area is full of cafeterias and restaurants and I/we really liked to vibe there.
Only thing what you should consider is it is the top layer (5 floor) and there is no elevator.
Otherwise it is a perfect air BnB flat.