I had a lovely stay at Kasper's apartment for 5 weeks and I would definitely recommend it to anyone who wants to be alone or with a partner (as there is only one bed).
The flat has everything one might need for a long stay, good internet connection (I was working from home some days), laundry, kitchen utilities, very comfortable bed... The flat is nicely decorated and has a warmth and cozy atmosphere.
It is located a bit far away from the city center, but in my case it wasn't really an issue. I usually bike everywhere in Copenhague. Besides, the surroundings are beautiful. There is a big lake and green area closeby where I used to go running or for a walk (or ice-cream / hot chocolate as there is a small coffee place in the same area).
The communication with Kasper was very easy at all times even though we couldn't meet personally as he was away.
The building is very quiet and it was relaxing to wake up with the sound of birds singing outside as there is a small park and trees. The flat has a lot of light during most of the morning, but if you want to work long hours in the evening, it is not so well lightened, so you better work at an office space.
For some it might be good to know that there is no lift in the building.
All in all one of the best airbnbs I have stayed so far.