My 7 yo DD and 4 yo DD share a room and they hate it. It started off ok but now they fight constantly. DD1's biggest complaint is she has no privacy and after a day at school just wants to chill on her own but she finds it hard as her sister is in the same space (we have other rooms they can go to but it's not the same).
Over the weekend we're looking at moving DD1 into DS1's room so DD2 and DS1 will share. It means DD2 is on the top bunk. Hope she doesn't fall out