Unfortunately, we had a poor stay at Peter's place in Copenhagen. There were a number of positives-
1) Host - Peter himself was easy to communicate with, met us in person, and gave us a comprehensive breakdown of the various areas and attractions in Copenhagen, most of which he marked up on a map for us.
2) Location - The flat is right around the corner from Nyhavn, with easy metro, bus, and pedestrian access to all of the city's key neighborhoods and museums.
-but these were outweighed by the negatives-
1) Neighbors - On our first two nights, the people upstairs were loud, but not unreasonably so. On our third and final night (a Saturday), they hosted a huge party which was going strong when we returned from dinner and continued until 4am. The thumping bass, shouting, and crashing around was so unbearable that my wife, two children (7 and 5), and I had to move from the bedroom into the living room to sleep since the noise was muted there. When I messaged Peter about this the following day, he responded that it was a housewarming party, meaning that the upstairs neighbors are going to be there for the foreseeable future.
2) Cleaning - Included in the apartment literature is a laminated two-page cleaning manual. The instructions were detailed to the point of being ridiculous and included things such as "You should expect to use 1 hour (1 person) on this final cleaning" and "Sink: to be washed with scouring powder. To be dried with a dry cloth." When my wife and I saw the manual after Peter left, it made the entire experience feel much less hospitable and relaxing.
While we enjoyed our time in Copenhagen overall, our accommodation was not a positive experience.