We had a great time in Copenhagen and in Pernille's flat. It's a good 20 minutes walk from the center but there are buses every 2 minutes from outside the flat, straight to the center so the distance wasn't an issue.
The flat is nicely decorated (although, things are not organized exactly like on the pictures), and comfy. We were 3 friends staying there, and we all got our own bedrooms, which is nice. The kitchen is well equipped and there are supermarkets minutes away from the flat, which makes things really easy.
If you are a runner, you can go for your morning run in the cemetery 200 m away from the flat. That's what I did :)
We had a great time and the flat is really good value for money.