Had a great time staying in Hans's place! It is right in the heart of hip neighborhood Grünerløkka with lots to see/do (including nearby river/waterfalls) and well-located on a tram line that will take you everywhere else in Oslo. It's a little more on the sparse side as AirBnB's go (no oven or microwave, smaller refrigerator), but how much that matters to you will vary. Hans is very responsive and helpful, and you won't find a better location (and for my stay it was very well-priced for any limitations).
Be sure to get coffee from Tim Wendelboe. Best in the world.