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.
How to create a gorgeous entrance in your home (79 Ideas)
Clever Built-Ins for Small Spaces - These shelves that fit around a door, by Lauren Rubin Architecture, are a clever way to squeeze a little extra storage out of a small space, and they give the doorway a little extra presence.