Robert is great. His guidebook (take a look, it'll solve any navigation issues you might anticipate) was a clear image indicating where to look and how to walk.
Roberts commitment to his guests and to hosting is admirable and clear to see, from being willing to share a dinner and preparing a good breakfast, to cleaning the place thoroughly (I was early,and he was doing it as I was there, thorough and clean).
If you have any questions he's happy to share his experience, and since he's been there some time, he knows what he is talking about.
Great stay, fantastic location (very brief walk or easy bus/metro ride to the city centre of Oslo) at a great price.