This is a college dorm, not a resort hotel. I liked that fine. It kept the cost a bit lower.
Like lots of European cities, Oslo is set up for walking and public transportation, not private cars. Which makes this hotel perfect. It's in the middle of town, within a mile on foot from all sorts of attractions. It's also within a mile of the ferry that can take you to Bygdoy, which has all the museums. You can also reach Bygdoy by bus, but preferred to pay for a short harbor cruise.
Vigeland Sculpture Park was my favorite thing, but seemed to be about 2 or 3 miles away, further than I was willing to walk. I hadn't figured out the busses, so my wife and I took a cab.
Oslo isn't cheap. It has always been expensive. My uncle reported that my grandfather wouldn't eat when he went back to visit in about 1960. He like the food of his childhood and could afford it. He just felt that it was too expensive. Maybe that's why he moved to the US in the first place.