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.
60 Under stairs storage ideas for small spaces. We could probably do this with one side and storage on the other? This would open up the current desk area for a more defined play space in the basement by getting rid of the current desk
Idea for tiny house if you have stairs to loft. The depth of space under a staircase can be sufficient for a built-in entertainment center that houses a flat-screen TV and a bookcase to boot, along with drawers for remotes, movies, and game accessories.