Sille's flat is amazing. It's full of interesting random objects typical of someone with a strong eye for style and design. It is also very comfortable and quiet and has everything you need including a really comfortable bed and a nice balcony; but if you like big showers this isn't for you..
Sille and Shiva are lovely and uncomplicated. Communication has been perfect.
The area of Norrebro is very interesting. Definitely go to Mirabel for coffee&croissants (and seriously amazing bread!!!) and next door in the evening, Baest, a great pizza and charcuterie/cheese bar with friendly, professional, super staff; the dj played blues, soul n rock&roll, great tunes. They are both nearby, on Gouldbergsgade. Also try Manfred and vin, a really nice wine bar also nearby.
Copenhagen is a great place, people are very friendly and relaxed. Food is amazing. I can certainly recommend staying at Sille's apartment if you go to Copenhagen.