I stayed there for 1 night with my family.
More than anything else, the location was amazingly great! I could reach every single tourist spot by easy walk(except Munch museum).
It's very close not only to Oslo S station but also to Karl Johans street. So I could get to the place very easily from the airport despite many heavy baggage. (Oh they also let me check in even at 11am. So thankful!)
At night, I even could go out at 10pm and walk through Karl Johans street all the way to the place and the ferry terminal.
Highly recommend the place.