The location of this AirBnB is definitely a plus (close to Grünerløkka, the city centre; supermarkets and plenty of nice bars and bakeries in the neighbourhood...). You share a small room in a bigger apartment. You can use the kitchen and you share a bathroom. The hosts were very accommodating and communicative. Decent place if you're planning to explore the city.
As a downside, apparently there are two rooms rented out on AirBnB, meaning that you share a bathroom with another couple and the hosts, giving it more of hostel than AirBnB feel. We didn't sleep very well as we found the bed quite uncomfortable (the mattress is small and too soft, so you roll to the middle of it as a couple). The common areas (especially the kitchen) are a bit untidy.