Option 1: Tram line 12 or 15 Kjelsås from Jernbanetorget to Kjelsåsalléen
Option 2: Subway to Storo, then tram line 12 or 15 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.