Grethe kindly arranged to accommodate for my solo two-night stay on very short notice and replied to my inquiry with all the necessary information very quickly.
The apartment building is situated within walking-distance of the metro Forum and was easy to find. The apartment itself is on the top floor and the building has no elevator.
It is very spacious and warmly decorated (there's even a stand-up piano). The balcony looks towards Central Copenhagen and there are no significantly taller buildings around so there is a feeling of privacy.
If I were to point out a drawback (other than the lack of elevator, which is par for the course), it would be the shower. In a design that is common to many European top-story apartments (such as the French studette - but this apartment is much bigger), the shower and toilet are put together in a small room in a DIY fashion. That said, it did not bother me.
The location is good as there are many interesting places to explore just north of Åboulevard.
Overall I had a very pleasant experience and would strongly recommend the apartment as a base for someone who is perhaps looking to explore Nørrebro or simply does not feel the need to stay in Central Copenhagen.