Arrival is perfect, if you take the bus from the airport the appartment is one minute from the bus stop. There is an electronic lock with a code that makes coming and going very easy.
The little street is charming, then you get the highway, railroad, bridges and other roads, but find your way through it and there is a bus stop, tube station and a small mall a few minutes away. Also near is a river that you can follow down to the city center and it's a very nice walk day or night.
The place is very clean and neat, I think it used to be a garage so it's not super pretty but it's pleasant and you get many appliances, dishwasher, washer and dryer, big oven, it just misses a microwave for leftovers. Knut also lent us a pair of bikes which is nice in Oslo.
Communication was good, very norwegian : not chatty for a bit but always quick to answer and efficient.
The problem is the bed, it's not suitable for adults. I'm under 70kg and I totally crushed the super thin foam and felt the planks through it.
I don't know about average airbnb prices around there, but I think this is a good deal overall.
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TL;DR : neat place, very modern, good communication, needs a new bed to be five stars.