Only a few minutes walk from the central station, this hotel is well positioned for a visit to Oslo. Most attractions are within walking distance and the public transport is excellent for everywhere else (You NEED the "Ruter" app for planning and buying tickets).
The staff were very friendly and we had no problems booking using expedia with no further costs. Fortunately our rooms were ready an hour before our booked arrival time so we could go straight up when we arrived on the train from the airport. The room was clean and had a TV, fridge, kettle, hair dryer, fan, and safe.
The breakfast was very good indeed and included in our booking price. It lasted us all day - a bonus as the restaurants in Oslo are expensive (dishes are around 250NOK each)
There are 16 Thon Hotels in Oslo. We would certainly come back to this one.