Our family of 4 had a wonderful stay in Sarah's apartment. The main floor, accurately pictured in the profile, is high ceilinged, full of light and looks out over the Akerselva river-- you can hear the water rushing by with the windows open-- we enjoyed sitting there resting after a day sightseeing. The kitchen was very well outfitted and convenient, with a 7 burner stove and large fridge, as well as lots of countertop space if you are inclined to cook. There are 3 bedrooms on the lower level, small as is typical in European apartments, but comfortable for sleeping. The full bath on the lower level has a combination washer/dryer, and was attractive, clean and functional.
The Grunerlokka area is a great place to stay-- not in the center or Oslo, but an easy walk. Mass transit--bus or tram-- is close by and frequent. We would usually walk along the river to central Oslo, a beautiful trek with lots of cascading waterfalls, parkland adjoining the river and old brick industrial buildings repurposed into lofts, restaurants, apartments and offices. We had several meals at the Vulcan complex, a food court about 25 minutes walk from the apartment, with seafood, tapas, sushi, burgers, coffee and macaroons.
Check in was easy--we were met at the apartment as we arrived, and had no problems during our stay. We had a week in Oslo, loved it and the apartment and would hope to visit both again.