Staying at John's apartment was the best experience not only in Oslo, but also my whole trip. It is full of the art works and small statues. The bed is actually sofa bed, but because of the mattress on it, I didn't noticed it till the mornig. His place was very spacious and clean which made me forget that the neighborhood seems a little dangerous. However, his apartment is close to every thing in Olso, the central station, cathedral, nice restaurants, shopping mall, and the city center. It takes 5-10 mins to walk to get those places.
John was very kind ans welcoming. And even though he describes the room type is private room, he let me use the whole apartment.
The only thing that I missed was that there wasn't a hair dryer (or maybe just I could not find it.)