The safehouse is used by members of the Legion operating west of the Colorado river. It is maintained by Atticus, who can be found there every 3 1/2 in-game days.
The key to the house is held by Lucius at the Fort, and can only be obtained from him. When speaking to him, he will offer it if the player has a "Liked" or higher reputation with the Legion. He does not carry the key in his inventory, and so cannot be killed or pickpocketed for it.
Outside, there is a campfire. Inside, the house consists of two large rooms connected by stairs. The room downstairs has two cabinets and three footlockers, all of which can be safely used for storage. One wall of this room is lined by marked shelves. There are three beds here, all of which count as owned by the player and confer the full benefits of well rested sleep. There is also a radio tuned to Radio New Vegas, and a water fountain providing clean water.
On each of the three beds, there are sets of Legion armor. One of the beds has Legion centurion armor placed on it, in poor condition, so that a player can receive a centurion's armor without killing a Legion member or Silus.