I also have limited wall space so I hang quilts on every little piece of vertical area I have from the side of the fridge, all the doors in the house ( on both sides), the sides of cupboards and for shower curtains. There is nowhere I won't hang a quilt!
As for size, I have no preference, I will find a way to hang or use any quilt!
Jaba, I should ask what size is best for you?
peace