Good points:
The apartment was so cute, and a lovely space to be in. Just right for two or so people. It was in a great location, walkable to the city centre and with great cafes and restaurants nearby. We met Sigrun at the end of our trip and she was so nice and friendly, which we knew from our online communication earlier.
Less good points:
The apartment was at the top of 4 flights of tall stairs, with no elevator, which I was not expecting. It was kinda difficult with heavy luggage. However, I think most of the older quaint buildings in Oslo are like this. Also, we stayed in the bunk beds, and the top bunk was really quite high up right near the high ceiling, with a very short rail. It wasn't a major issue but I wouldn't let a young child up there, as they could easily roll off.
Overall, it was a great place to stay with an excellent host.