My wife and I are on a journey through Norway and the Clarion hotel in Oslo was our first stop after arriving from the US. Well located across from the opera house in Oslo, I highly recommend this hotel.
The staff were excellent, eager to help and warm throughout the process. We really enjoyed our stay and of particular note is the quality and diversity of items in the breakfast buffet. They also serve tea and cakes in the afternoon, as well as a fixed menu dinner buffet after six, all included in the nightly rate.
Perhaps the only concern would be that the place could use a refresh as the decor is a bit tired.