The location looked okay, but my room was right on top of a restaurant bar with live music. It was very small, and I later found out I had booked a room on the "economy" side of the hotel. It had no A/C, and the air was very stuffy. Did I mention the room was small?
The breakfast was awesome - but given that I left early, I wasn't able to enjoy it on the second day, and I was not allowed a refund. Overall, there are better options in Oslo. Even by Oslo standards, this was expensive.