We stayed here for a week, two adults and to grown-up children. The apartment was large, over two levels and contained all the facilities that we needed. It is around a 20 minute walk from the main train station but public transport is just outside the door(bus) or metro and train down the road.
The area around has lots of supermarkets, restaurants, bars, etc.
If I was to find an issue, then for some people the four flights of stairs might be an issue, but any older building in Copenhagen would have the same issue.
Great place to stay.