We really enjoyed our stay at Peter Andreas' adorable and well-loved flat. It is as idiosyncratic as you'd imagine the top floor of a 17th century building to be. You couldn't find a more central place, with a great view and plenty of coffee shops, restaurants, and sights in walking distance. Peter Andreas and his partner were super friendly, very responsive to messages, and very punctual for checkin/checkout.
The apartment has a lived-in feel, a bit like staying at a friend's place (drawers aren't empty, so someone still seems to live their occasionally). The place was lovingly renovated several years ago - the style is nordic and timeless, though the age is noticeable in a few places (the fair price we paid per night reflected this). The flat was cleaned well, though, and fresh bedsheets and towels were provided. Peter Andreas had thoughtfully left some extra duvet covers and sheets - we arrived during a hot and humid spell so we were grateful to have extra.
A minor criticism is that the listing mentioned two bedrooms, when only one room actually had a door to close. I was traveling with a good friend so it wasn't a big deal for us. A note for folks with a fear of heights: the small attic bedroom with a single bed and a desk might requires a climb up a ladder, so best to call dibs on the bedroom or couch.
This might not be the place for you if what you're really looking for is an air-conditioned hotel room. But if you're looking for something really special and centrally located while in Copenhagen, I can wholeheartedly recommend Peter Andreas' wonderful little place.