We had a great time during our 15 day stay in February-March 2018. The house is everything depicted on the web-site -- mid-20th century house and furnishings, all in great shape.
Best of all, it's a great place to stay while exploring Joshua Tree National Park. Turns out that the North Entrance to the park (in Twentynine Palms) gets much less traffic than the West Entrance (closer to Palm Springs and LA). There are never more than 2-3 cars in line at the North Entrance, but there were 40-50 cars at the West Entrance one Saturday when we drove out that way. So you're far better off staying to the east in Twentynine Palms, and using the North Entrance.
The situation was great -- the house is set back from others in the desert, so has privacy, yet Highway 62, the main drag in Twentynine Palms, Joshua Tree and Yucca Valley, is easily accessible. The nearest store is the grocery store, so very convenient, and the local restaurants were much better than we expected.
The only minor issue is that at this time of year (February), it takes a day or two for the concrete floors to warm up if the house has been unoccupied for a few days. But the heaters warm the air immediately, so just bring some slipper or thick socks, and you're fine.