This is a perfect combo of my two favorite ideas for that space under the stairs leading to the basement. A reading nook AND book storage and shelves . assuming that there is enough space for this there.
A barn-style door hangs in front of the two-compartment closet and slides open as needed. The suite's large closet is divided into two zones. Half the closet accommodates hanging clothes while the other side caters to folded clothes with built-in drawers