Great place. Very convenient location - walking distance to Central Station, the Opera House, etc. There is a metro station nearby in case you are too tired to walk ;) The host gave a very clear direction of their place.
We arrived earlier than the check-in time but Naruemon and Martin kindly let us leave our luggages in their place, and gave us advice about where we should go, and how. When we got back, they had moved our heavy luggages into our room already (thank you!).
The room is very clean and comfortable, also the bathroom. We used the kitchen to prepare some sandwich as we would go to a train trip in the next day.
We will definitely stay here again when we are back in Oslo :)