Where do you keep your LO's books- playroom? bedroom? family room?

We have a dedicated play room on the first floor, and currently the majority of my LOs' books are on a long IKEA Expedit shelf that doubles as a TV stand, and I take library books upstairs to their bedrooms. But since we mostly read upstairs before nap/bed, books get dragged all over the house.

I do like to have our books on display, but since I like for the girls to have access to books at quiet times (generally spent in their rooms) like "nap" and bedtime, I'm thinking of purchasing some new shelves and moving them to their bedrooms. The only issue then becomes how to divide the books between them.

On a bit of a reorganization quest this week, and I'm just curious what other people do!