We were in Oslo for 5 nights. Absolutely loved Henrik's place. He met with us bright and early to help us check into the apartment. We wanted to see what was like living in Oslo so we made good use of his kitchen, bath, etc. His space is wonderful -- comfy bed, sophisticated decor, kitchen with great induction stove, comfy balcony.
The Grunerlokka neighborhood is chock filled with restaurants, bars, scenic parks and a waterfall. Check out Tim Wendleboe (best coffee literally right next door), walk along the river to catch the waterfall, Mathallan (big food hall with diverse vendors), Blå (hip music venue), Grunerlokka Brygghus for beer and fish and chips, Schouskjelleren Mikrobryggeri for a sweet intimate underground brewery with a great selection... the list goes on.