I would like to clarify that we didn't stay long enough for the tour.
The house itself is nice, but honestly isn't even the best sight in the historic district. Basically, this is a good stop for a history of Sioux Falls, but unless that tiny grain of world history is going to rivet you, you'd be better off spending your time somewhere else. It is nice that it's free and near St. Joe's, but it doesn't offer the same experience as the Pavilion or the Outdoor Campus, which are also free and in town. My opinion would be to skip it for time other places.