Cecilie's flat is in the fascinating Norrebro. It's a great flat, and we had the best time.
You should be aware of a few things:
1. Norrebro over New Year is Fireworks Central. Seriously, this was the most intense use of private fireworks you can (or cannot) imagine. This is not Cecilie's fault, of course, and we would have booked the flat anyway.
2. Another reviewer mentions the really tiny bathroom. It's smaller than that. It is just over a square metre, or four feet to a side. But it is big enough - that bathroom is a miracle of space engineering, and you should see it. :)
3. We rented bikes from Donkey Republic, which aren't exactly Tour de France bikes. But they're good enough, because Kopenhagen is really flat - there are a number of pick-up points right near Cecilie's flat. You haven't lived until you've cycled in Kopenhagen.
4. Cecilie left us a great little map of Kopenhagen, which helped a lot.