Sisterly compromise

The girls share a room.  A small room at that.  It's finally finished being decorated and looks all cute...when it's clean.  Problem being, the cleaning part.  Mia likes things very orderly and tidy.  Everything in it's place with unnecessary things thrown away.  Juliet likes things messy.  Never puts her stuff away and keeps everything that has ever come in to her possession, including tags from things.  Cleaning of the room becomes a battle nearly every time.  Where's the balance?  Someone please tell me there is one, short of a line down the middle of the room?