It's hard to say which is better: the room or the host! If you don't know Grunnerløka is an awesome part of town, and Ingar's place is in the perfect part. Still an easy walk back down town. The view from the balcony is beautiful, as you can tell from the picture. Enjoying coffee and a book on the balcony was definitely one of the highlights of the stay for me. The whole apartment is very chic, aesthetically pleasing, clean and functional, and I felt totally at home there. Make no mistake, the room is definitely quite small, but it will serve your purposes! You should be out exploring anyway! And I never ever felt uncomfortable lounging in the main room or on the balcony so I never felt cramped at all.
Ingar is truly a great host. He's friendly and welcoming and truly strives to make the experience great. I really enjoyed getting to know him, and he was definitely helpful in finding things to do in the city. maybe the one criticism there is that he loves his neighborhood so much that he seems to legitimately think no other aspect of Oslo is worthy seeing haha.
One final piece of advice: GET A COFFEE AT TIMOTHY WENDELBOE!