Om Shanti Estate is a museum on Aotea Terrace in Huntsbury, a hillside suburb above central Christchurch, and holds a 5.0 rating from its sole Google reviewer, who warns that the stairs are slippery when wet.
Small estate museums tend to run on their own timetable rather than a civic one, so confirming opening hours by phone before you climb the hill is the first rule of visiting. Expect an unhurried, personal look around: at places like this the owner or guide will usually talk you through the collection, and asking about a piece that catches your eye is the surest way to hear the stories behind it. Allow more time than you think, wear shoes with a decent grip, and check the forecast, because hillside sites and wet weather rarely mix.
That personal, unhurried kind of visit is what a fine afternoon in Huntsbury is for.