Option 1: Tram line 11 or 12 Kjelsås from Jernbanetorget to Kjelsåsalléen
Option 2: Subway to Storo, then tram line 11 or 12 Kjelsås
From Kjelsåsallée it takes only 10 minutes on foot. Follow Kjelsåsveien down until you see the museum on the right side of the road.