The apartment was very comfortable, well furnished and nicely decorated. It was spacious enough, I was on my own, but it would not have felt cramped with an extra person for the 7 nights that I was there.
The kitchen has the necessary equipment to cook and even has a dishwasher. The bed is comfortable and the apartment was warm even though it was below freezing outside. I was not bothered by any noises from neighbours although you could occasionally hear people moving about.
It is conveniently located about 3 minutes walk to a busstation (which can take you to centre of Oslo in 15 minutes) and about 10 minutes walk to the BI School (or short bus ride) which was why I chose it. The key pick-up and drop off is about a 10 minute walk from the apartment, something to keep in mind with luggage.