We've tried a curtain pole on the room wall but we never really liked it and have been keeping our eyes open for an alternative. While in Germany this year, an old hotel had solved the similar problem with a pair of ~8mm dia. stainless steel rods each a bit over half the window in length. Each rod carried a curtain and was mounted on a simple pivot at the side of the top of the window such that the curtains could be rotated to be over the the window or hinged back against the recess.
Does that description make sense ? How difficult it is to describe something in words ! Anyone seen anything similar for sale anywhere ?