Grandsons room

I am wanting to convert our guest room into a room dedicated for our 2 grandsons when they come over. I have great ideas for this room, but would love suggestions and or photo's from others. The room is small about 9'x9', so storage is important. I do want to put in 2 twin beds. There will be a dresser that holds a small TV and I want to place a short table under the window between the beds. I was also thinking of painting the floor with roads and games for them to play. Our house was built in 1904 and I have already painted the floors with black floor paint up stairs since the ceilings are barely 7 feet tall we are unable to add a new floor unless we tear out the old pine floor. So I would love suggestions!