I have a great office. It's a yellow bedroom at the top of the house looking north to the Oakland Hills. It's got a futon in it to rest on (I'm a big believer in sleep writing) and it's all mine.
That said, I usually work other places in the house.
I work on the couch in living room, one pillow under my head, one pillow under the laptop on my stomach, and my feet up.
And I spend a lot of time standing here, gathering inspiration.
(The complete gallery is here: http://www.redroom.com/gallery/erickas-workspace)