Anders and Joanna's place was absolutely perfect for my stay in Oslo. I would equate the apartment to more of an "upscale hostel." The privacy of your own room, and while you have to "share" bathrooms, they are private bathrooms/showers and extremely nice - modern, updated, and super clean (with a hairdryer!!). There are also washing machines/dryers in the bathroom to use, which was very convenient for my 9 day Scandinavia trip.
In terms of location, I thought this Airbnb was perfect. Right next to the train/metro station (Nationaltheatre Stop) but also a short walk to city center. I had to leave at 5am the next morning, and while the trams weren't running, I was able to walk to Oslo S in under 25 min. Keep in mind though if you have a lot of luggage and have to leave early, you may want to be closer to Oslo S.
Overall, I had the perfect time at this Airbnb and highly recommend to anyone traveling to Oslo!!