I really liked this apartment. It's a very atmospheric beautiful old building surrounded by other similar buildings in the neighbourhood, and within walking distance of many tourist attractions, shops, cafes etc. The room was very clean and bright (the photo in the profile shows it in the dark, but during the day/summer it gets a lot of light). The kitchen was perfectly adequate for basic cooking, the bathroom was fine, and the huge TV with Netflix was a surprise. It's very quiet and I slept well.
I only bumped into Katrine once. She was very friendly, and communication beforehand was smooth and efficient. I would definitely stay again the next time I visit Oslo.