First of all, the location is great! Tjuvholmen's place is not large, but she shares whatever she can, and that's really kind.
The room is very small for 2 persons. It isn't even 2 meters wide. For example, it is not possible to change your clothes at the same times in this room.
Besides this, Tjuvholmen is a kind woman. They are sleeping/living at the same floor as you seperated by a curtain, which may reduce your privacy.
I would recommend this place for a short stay in Oslo and also for only 1 person. The location is great and the house is clean.