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.
Narrow walk in closet with lots of built in shelves.of course the reality is that if this was your closet, it wouldn't look like this. Not all your clothes may be black and I'm guessing those nice shelves would be full.
I maybe like this idea with the wooden beam at the end of my bar. maybe the wine in on the side of the bar opening only. :) Diy Wine holder, (maybe bigger beam in natural looking wood where you cant see the bottle neck)