What a gorgeous loft-style bedroom. I particularly love the whitewashed exposed brick walls and the low-lying mattress bed. The addition of the slim staircase leading to a tiny dressing space is just gorgeous and such a great use of space.
IKEA - BILLY, Bookcase, white, adapt space between shelves according to your needs. A simple unit can be enough storage for a limited space or the foundation for a larger storage solution if your needs change.