My parents are working on furnishing their new retirement home (they want to spend their winters out of the snow). Since they haven't actually retired they need office space without compromising guest space.
For a big desk to work in the same room as a bed I feel like you have to have a big space so it doesn't feel cramped.
I love the idea of turning closet space into an office.
One of my favorite ideas is the use a piece of furniture, like an armoire or roll top, to hold your office.