Valerenga Church is not just a place of prayer, but a well-known tourist attraction as well. Make a pilgrimage and enjoy the peace and quiet.
You're spoiled for sightseeing choice when staying in Gamle Oslo. Valerenga Church is an ideal place to start here, but there are lots of other worthwhile places to appreciate. Oslo Opera House, Karl Johan Gate, and Viking Ship Museum are not far from the house of prayer and and will cap off your day nicely.