Before I review the apartment, let me start by saying Malene was an excellent host who really went above and beyond during my 4-night stay. She reached out before we arrived to offer to rent us bikes and she was incredibly responsive and accommodated two requests that could have very easily been met with, "I'm sorry that isn't possible."
The space itself is amazing. Because you are on the top floor, the natural light and the breeze through the windows is amazing and there is no noise from neighbors unless you have the windows open. The living room is super comfy and the bathroom is huge for Danish standards! The beds were very comfortable. The location is perfect to be in the middle of Copenhagen, in walking distance of everything (if you need quiet while sleeping with an open window, central Copenhagen may not be the place for you).
In response to other reviews claiming the apartment could have been cleaner, I found the apartment to be clean enough that I did not feel the need to clean before settling in. If you are looking for hotel-level service and cleanliness, maybe don't stay in an Airbnb that is someone's primary home. Book a hotel. I don't recall seeing any Airbnb's in Copenhagen at a reasonable price that weren't clearly owner-occupied from the photos/reviews. I'd imagine this is due to Danish housing regulations that make speculative real estate rare.
100% would stay again in Malene's Airbnb on my next trip to Copenhagen.