I have talked to our newly employed maid at the first day since she arrived our home. She knows this beforehand that she will share room with our baby, and cannot close the door. So no problem for our family.
But when the summer comes, she'll turn on Air Conditioner. Don't think it's good if I ask her to keep the door opened. Also, I have a cat, I don't want her to go into the maid/baby's room.