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.
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reading corner nook with window seat and built in bookcase : Decorating Your Reading Corner. decorating a reading corner,decorating ideas reading corner,home reading corners,reading corner decor,reading room decorating ideas
Not that I have an empty closet, but i do like this."Closet Office" - Turn your un-used closet/reading nook into an office space. Maximize the little space with lots of shelving and storage *LIKE CORNER DESK/nook & shelving for office corner