^^Pretty much what I was thinking. A bookcase seems like a good fit. "Not packed full" is good advice.

I think the desk across that wall with a set of shelves on the wall next to the window will have balance and make the window look on purpose.Since it is a narrow room that is pobably the best spot for the desk

Another thought if the room is deep enough to accommodate it- consider a low storage unit placed under the window, hopefully long enough to span the whole wall. Then 2 or 3 floating shelves to the left of the window, and the desk on the left or right wall. That would provide storage and possibly a window seat in the bargain if you choose a sturdy piece with short or no legs.

Look at Ikea's media storage for ideas (perhaps LIatorp or Hemnes) or the single Kalax unit, which can be placed horizontally.

https://www.ikea.com/us/en/catalog/categories/departments/living_room/10475/

https://www.ikea.com/us/en/catalog/products/00275848/

And for shelves (these brackets allow you to cut the shelf to a customized length but still have nice finished ends):

https://www.ikea.com/us/en/catalog/products/S59119605/

I think that space might be best for a small desk with a piece of art above desk.

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