i arrived at 9 pm without reservation and was immediately led by a helpful man working at the night desk to an available single room with private bathroom. the room is small, clean, and cozy, with hot shower. it's more than adequate for my purpose. the hotel building is more like a courtyard style, so you may hear some voices talking during evenings and mornings, but it's nothing disruptive. i would have no hesitation coming back to stay here when i find myself in Uyuni again.