We loved staying in Mikkel's flat for our short stay - the apartment is nice and spacious, and has all the amenities you could expect and a bit more (we had fun with the sound system!).
It's also a superb location; we've stayed in more central/more tourist-centric places before in Copenhagen, but it was very nice and quiet in Frederiksberg, with plenty of great shops, restaurants and cafes to explore in the surrounding areas. The metro is also super close by, and gets you easily in and out of the city center. The one thing to bear in mind it's a top floor apartment, and there were always more steps up/down than we remembered; but that was hardly a problem for us.
Mikkel also very kindly contacted us on our final day to say that we could stay later than the stated checkout time, but unfortunately, we had a flight to catch - otherwise, we would have taken him up on his offer! We would definitely recommend staying here.