I felt very welcome at Pål's place and the stay was very pleasant. The apartment and the room were nice, and the amount of books made sure that even if it was pouring rain the whole time, there would be something to do. There are all the main things you might find useful during your stay (wi-fi, washing machine, etc.).
The neighborhood itself is very calm, clean and green. I stayed at Pål's place during my course-week at the University of Oslo, and its location was perfect, as it was ~20 minutes walk to the university and ~30 minutes walk to the center. There's also a subway nearby if you want to visit more distant places.
Overall, I am very happy with my stay in Oslo, and I sincerely recommend this place. I know that if I'm to go to Oslo again, I'll gladly stay there again.