Really NOT recommended!
I had booked for 4 people but asked well before arrival if it was ok to change the reservation to 5 people, something he agreed on. But right before arrival he wanted more money for the 5th person than what it was stated via AirBnB and "preferably in cash", something I refused. He wanted then to cancel the reservation although we had already checked in and accused me to AirBnB for bringing more people than stated in the reservation although we had agreed it was ok to upgrade it. Eventually he agreed to formally change the reservation to 5 people but keep asking extra money via AirBnB.
In addition, the apartment was not really ready! Dryer, washed and dishwasher were running. We got only 2 towels for the 5 of us, the rest were being washed! Since we were staying only one night and to avoid further contact and conflict, we simple agreed that 2 towels were fine.
On top of all this, the apartment had moths! One of the double beds was actually a wide single bed and only single bed top sheets were provided for both double beds.
It was really an unpleasant experience which I do not recommend.
The apartment was not even in Gamle Oslo as one would thought from the name of the listing.