This looks like it could also be a bedroom, which is even better.
Couple things: I love the floor-to-ceiling windows and I think this whole vintage 70s decor is pretty cool. Yeah, I'd live here.
This stirs the rustic-loving parts of my heart. The only thing I would still add is a couple of large, colourful, plush area rugs for that brick floor.
image source [many, many more library and book-centerd decorating ideas here]