We stayed in the "barn" which is a large two story "cabin" with beautiful woodwork and all the amenitities. We were able to prepare most of our meals in the upstairs kitchen and spent a lot of time just relaxing in the great room watching videos or hanging out.
This building has a ton of storage, so you can put everything away while you're there, and still access it easily.
Three of the five bedrooms were spacious and very comfortable, two of the five were small rooms with single beds, not a good choice if your claustrophobic, but worked for our kids.
Beautiful area, 15 minutes from Krull's market, and centrallly located for trips to Mt. Rushmore, Crazy Horse, Custer State Park, and the Bad Lands (about 1 1/2 hours to the visitor center).