We are a family of four (kids are 10 and 14). The place was just as advertised. We had a great time there! The location was great and central to all experiences one would want in the city. It was also relatively quiet, given it was facing an indoor courtyard. There were two beds where we could all sleep. There was also a sofa for extra sleeping if need be.
The place was clean, though obviously being lived in, and it had great amenities.
Some things to note:
The beds were good, though one of them was softer than we are used to.
The place is on fourth floor, no elevators, so be prepared for the stairs. It was a good exercise :-)
Finally, Copenhagen was unusually hot and most places do not have A/C -- so it was a little warm during the nights. But Line (the host) was great and had actually bought ice cream for us to help keep us cool.
We would definitely come back and stay with Line again! Highly recommended.