good things first: great location, great communication with host, Barish was available and helpful.
I would not call it a studio, the place is very small and can barely accomodate two people.
Once in the place, we noticed that the bathroom and kitchen were not cleaned at all: mirror was dirty, shower had hair from the previous guests, kitchen was also not really cleaned.
The sofa-bed maybe used to be clean but now you can tell is old, dirty and uncomfortable. By the way we paid the cleaning fee.
All in all, it could be a great place if there was the minimum investment in wanting to make it really a 5 stars place to stay in Oslo.