My husband and I stayed at Mads/Claire's place for 4 nights. Even though we never met them in person, communication through Airbnb messaging was very smooth, they responded to all our questions very quickly.
The apartment is located in a residential area with little traffic. We did hear some people talking loudly on the street during the weekend late into the night and there was quite some noise on Monday morning maybe from some trucks... but otherwise it's a quiet place. We were also able to walk to many places of interest (Tivoli, Central station, Meatpacking district, etc.). Anything further is reachable by a short Metro or bus ride.
The apartment is very bright, spacious, and clean. The only disappointment was the shower room, which was quite small (not uncommon for CPH) and had a damp smell. There was nowhere to hang towels or anything at all.
A couple tips for future guests: bedroom curtains are not black out and it can get very bright in the morning, so bring an eye mask. Also, the apartment is on a second floor without elevator, so beware if you have big suitcases or mobility issues.