My home. I love having an area that is for myself. My "man cave", "hobbit hole", "dark cavern", "lair", "secret coven", etc. It's a place that someone can go to for anything. Where they feel safe, where they enjoy themselves. Anyone should have one and everyone should have one. It's nice to get away every once in a while.
Though for my man, David, it is really easy because the living room is his man cave. His xbox is there, along with his laptop, the couch he picked out, the kitchen nearby in case he is hungry, the door to the outside grill which is three feet away from the door. That is his area.
My area is the bedroom and my office. We share the bathroom. I typically give him the space he needs so he doesn't require a man cave.