This is a beautiful, charming apartment with a kind host. Runa was very communicative and check in/check out was a breeze despite my train running late getting there. This is their actual home, though, so be respectful! The Japanese bed was indeed quite firm (read the listing) but I actually found it quite comfortable and slept very well on it.
A tram stop is pretty close, so it was easy to get around the city. Also Assistens Cemetery and Jægersborggade are an easy walk away.
Overall I recommend this apartment for a weekend visit to Copenhagen.