Up until a year ago, because my boys and I were living with my mom and sister in a 3 bedroom house, my boys and I shared a room! Now, they have their own room, but they still have to share it with each other. They are 12 & 14. I would prefer them having their own room, and so would they, but until we can get into a large enough house, there's just no way to do it. They understand it, don't always like it, but they don't complain too much.
They have bunk beds. It takes up the least amount of space, they still can have their own dresser drawers, they have to share a closet, and then there are two small shelves in the room. It's not as big as it sounds... very little space for moving, but that's ok, cuz when they are in their room, they are either playing video games, watching tv or sleeping!
Remember the Brady Bunch had three kids per room! LOL!