I like to refer to it as my "Lady Lair" to other people, but mostly I just call it the "front room" or the "sewing room" - it's in the living room so a third of it essentially a hallway, and I can't quite ever relax and let myself be fully creative (messy) in there because it's a public space that all our guests walk through. (Though it's always some degree of messy anyway)
DH & I are considering moving in a year or two (or whenever) and one of the first things on the "must have" list is a private sewing space for me - a spot that people do not go tromping through and I don't have to keep it "presentable". Then I might feel like "Lady Lair" is true!