It's a very nice cozy little studio located on the ground floor of a building in Solli. The apartment has all the amenities, including a washer/dryer in the bathroom and a nice big working desk with a monitor/keyboard/mouse plugged into a USB-C docking station. The bed is large and comfortable. The glass wall separating the "living room" from the "bedroom" is a bit silly, but hey, it's stylish.
The host was very nice and polite, provided very detailed self-check-in instructions (with a keybox) and offered advice on what to see and do in Oslo.
Definitely recommended, I'll try to stay here again.