I stayed here for 8 days. Great instructions and good communication leading up to the visit. The apartment is spacious, tidy and clean. The balcony has morning/midday sun, and is above a not too busy street, which makes it great place to spend some time in the day.
The apartment is perfectly situated in the middle of town, so traveling to practically anywhere in Oslo is easy.
I enjoyed my stay here very much, and will hopefully be back another time.