Henrik & Frederik are one of the best hosts I have ever experienced. Friendy, helpful and trustful. Their flat is furnished tastefully, is located 10min by walking from the ctiy center away and the cleanness was in general very good. Perfect for me was that I could leave my luggage in the apartment until the evening on my last day. That was nice, because my flight went late in the evening and I did not have to carry my luggage through Oslo the whole day.
I would recommend Henrik's and Frederik's flat, if you want to have a nice stay in Oslo and don't want to spend a lot of money for a hotel. If I am going to go back to Oslo I would choose again this apartment.