Lars was out of town while I stayed at his apartment, but he leaves me a good instruction for the check in. A tip for future traveler, turn to the left once out from the lift, you will see indication of apartment number after the wooden main door. The apartment is tidy, well equipped, located in a quiet area, easy walking distance to Oslo S and all the attractions including Oslo Opera House, Bjørvika Barcode, Karl Johans gate, Aker Brygge, etc.