My friends and I always rent the same condo in which the married couple take the large room with bath and Jacuzzi, I get the room with a large bed with bathroom and the married couples mother [hers] gets a room with two twin beds and hallway bathroom. How should the cost be fairly divided so no one feels like they are getting the short stick? I will take the twin bed this time to give "Mom" a change but I think I and her need to get charged less for less "nice things". How is this fairly divided?