What a strange experience and oddly aggressive host
I was to stay at this place for 5 nights. When I first checked in the heating wasn't working. I contacted the host and they sent somebody over to partially fix it. That is, they got the heating working well enough that I could sit on the couch under multiple blankets, but not well enough that I could comfortably be in the kitchen or sleep in the master bedroom.
The next day the host sent me to go pick up an electric heater at a different apartment, but had given me the wrong access code and did not pick up the phone when I called to get the right one. So I spent yet another cold night in the apartment.
This is one of the nice older buildings in Copenhagen and stuff happens, so all of this could have been remedied easily. What is really weird is the attitude I was met with: I was clearly bothering the host with these trivialities of heating and it was surely my responsibility to pick up the electric heater, not theirs. I called them multiple times with no answer throughout. They admitted no fault and I am sure they still think me incapable of turning the knob on a heater.
I left the following morning. Airbnb was kind enough to reimburse me after I filed a complaint.
There was a weird smell and the shower drain didn't work (neither of which I informed the host about).