The house of books!
It's been a while since I've been in a…read morebookstore. We have certain websites that have done away with most bookshops like these. It reminds me of a Barnes and Noble in a large city, with a deep, narrow 'shotgun' store configuration. The book store was well sorted, and the books were mostly in Spanish. We came in looking for some Spanish fiction written by a local author. With a little help from the clerk, we managed to find the book quickly!
They also sell art, maps, and postcards, but those seemed to be a bit pricier (and nicer) than the ones in the souvenir shops along the touristy areas. This bookshop, while in a toney side of town, seemed to be frequented by the locals. Many of the books were in Catalonian, not Spanish.