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.
DIY Shelves Easy DIY Floating Shelves for bathroom,bedroom,kitchen,closet DIY bookshelves and Home Decor Ideas
16 Smart Attic Bedroom Design Ideas Makes me wish for a loft conversion.But then I think of the mess and decide against it!
Under stair closets - doors on the side are so much more accessible! For my basement stairs!
Under stairs reading nook - apparently I need a house with lots of staircases for all these neat ideas