We stayed in Unit #6 for 5 days in the beginning of July 2012. The room was very nice. Clean and airy. The porch view was amazing.. lightning over the mountain at night was a sight to behold. The beds were very comfortable. The pull out sofa bed not so much. Bathroom was clean, shower had good pressure. David was very accommodating with getting us what we needed (towels, etc). It was within minutes of town, 10 minutes of Crazy Horse and 35 minutes of Mt. Rushmore.
Our only problem was the directions to get there. We drove from New York arrived sometime around 2 or 3 in the morning..Driving through pitch black Custer State Park with all its curves and possibility of deer/bison jumping out at us (didn't happen but still..we avoid rats and people driving in NY..not bison.)
To make it easier for whoever stays here in the future please just put these coordinates in your GPS. It'll take alot of the guess work out of it.
Longitude : -103.54647 (103°32′47.296″W)
Overall, i'd definitely stay here again.