I'm native spanish speaker and "bookcase" would be "estante" or "librero", "librería" is "bookstore"
Great, thank you. I said estante and was surprised by the correct answer.
Hmmm, well, for me biblioteca would be library, which in a house would have to be a whole room, estante would be the bookshelf and libreria would be the case in which some books were held. My dictionary says libreria is bookcase.