A point about pronunciation. The 'r' in Terje is rolled so that Terje's name is pronounced like the word terrier with the r at the end left off. I butchered his name until set straight. If you read this review, you can avoid that fate.
I can't say enough about Terje's willingness to go beyond his role as a host to become more of a friend. He met me at the platform in the railway station, helped with my luggage and showed me the efficient way to get to his place. If I had to rely on the map and directions from Airbnb (generated by Google I believe), I might still be wandering the streets of Oslo. He also introduced me to a coffee shop in the train station that provides a free chocolate croissant with coffee before 10:00 AM.
Terje's cat is a young one with lots of play in it. If you don't like cats or are allergic to them, this is not the place for you. I have two cats, so I thoroughly enjoyed having a cat in the house. The apartment is located easy walking distance from the center of town and all sorts of mass transit. There is access to a market for breakfast foods and the kitchen is available for preparing meals. There is also a TV in the guest bedroom. The apartment is on three levels, with bedrooms and bathroom on the first level (7th floor), kitchen and living area on the second and a deck on the third. There are internal stairs to get around and also an elevator that could be used to get to the second level.
Oslo has many wonderful attractions, and Terje can help you in deciding which one is the right one for you. I came to Oslo from Bergen as part of a Norway in a Nutshell tour, which is a great way to see some of the country. The Viking Ship Museum and the Polar Exploration (Fram) Museum on Bygdoy and the Museum of the Norwegian Resistance in WWII on the grounds of the OSLO fortress were excellent. The Vigelend Museum and Sculpture park were amazing, as was the Munch Museum. Depending on your schedule and interests, the Oslo Pass is a good option. There are also senior (over 67) rates for many attractions.
Staying with Terje was the icing on the cake of my Oslo stay.