The twins

Grabbing their bags the twins dash into the house, beating everyone else there and taking a moment to look at the beautifully decorated front room of their holiday home, a short step leading up into the kitchen diner.

At the far end of the room a short corridor has doors off to bedrooms on the left and the right, and then a flight of stairs going further into the house.

First ones in the door, means first pick of the bedrooms, so where do they go?