Me and my 2 friends stayed at Jan's apartment one night. He is a very friendly host and was always available for all the quesitons we had :) The apartment is located perfectly in the city center, maximum 10 minutes walk away from the central railway/bus station. As for the apartment itself - everything you need will be there, as well as clean bed sheets and towels. The beds were comfortable, perfect to sleep like babies after exploring Oslo whole day :)
If you are looking for a place at the city centre and near to Oslo bus terminal this is the perfect option.
No hesitations at all!