Do you know which windows you like to have open on your house, to get the best breezes? That can help you figure it out.
I have most of my windows on the east and west sides, including the big ones. They give a lot of cross ventilation, plus light early and late in the day.
My north wall is solid. That's the wall I designed the roost to be up against. We usually get a big drift there in the winter.
My south wall has the pop hole door and another small window. The run used to be shaded by a big tree, but now it's roofed. It keeps it in the summer, plus keeps out the rain and snow.