The apartment is really nice, even more beautiful than in the pictures. I didn't meet Iselin but her dad brought me the keys and was super helpful. Iselin gave me instructions on how to get to the apartment - everything was convenient and worked out well.
The apartment is located in Grunelokka, which is a beautiful, hip area a bit to the side from the city center (still, walking distance. It's Oslo.).
I would definitely stay at Iselin's place again and warmly recommend!