This was a good collection of stories. Most of them were relatively easy to read in Spanish (intermediate-advanced level). The hardest, language-wise was probably Cortazar's story. Most of the stories were Borges-like mini-mysteries. The parallel text saved me the trouble of looking up some words. But do be aware, as some translation is wrong (even I was able to pick up on some mistakes in the translations.) I only didn't read the last story, because the first two paragraphs were entire sentences!