My stay at Jang & Christian's was supremely excellent in all regards. They are wonderfully friendly hosts and have a beautiful home to share, including, no exaggeration, the single nicest bathroom I've ever had the pleasure to experience. The room was very lovely; the apartment is on the 8th floor so it is plenty quiet at night. Jang & Christian are happy to give tips on exploring Oslo, and are very knowledgeable about their beautiful city. The apartment is also located in a very interesting district jutting out into the harbor, with a museum, sculpture garden, small beach, and platform for dipping in the bay within 1 minute's walk. It is also within easy walking distance of central Oslo and even some of the slightly farther attractions such as the Vigeland Park. Overall, I feel like I left with not only an amazing experience but new friends!
Extremely recommended!