I do (and so does dh, though he works from home, so really needs it).
It's not very big: it is blue, has bookshelves covering one wall up to the door, plus another small bookcase. I have a big table for my computer and stuff, and a bureau. And I have a CD player/radio. And a filing cabinet. And there's a fireplace: on cold winter days I light a fire and push the door to...it's bliss.
It is usually a terrible mess though. there's too much stuff in it because I dump things in here and I never have a chance to clean and tidy it because it's last on the list of priorities. However, I did have a clear out in here last Saturday afternoon, threw out loads of stuff and cleaned, properly, for the first time in...ahem...rather a long time.
I love my room!