Not sure how much this book has helped me, since I am doing other things to improve my spanish?
It was easy then not so easy, then boring (more to do with comprehension than plot), then towards the end everything started slipping into place at a faster pace. I found a lot to be desired from the overall plot, there was little if any character development and at some point near the end I found out that a character was a woman. I don't know if I totally missed it initially but I was shocked when I found out.
I am not gonna bash these shortcomings because the story isn't exactly the focus of the book. The comprehension of the themes, descriptions and rhythms of the language is the point. For that it was good, I try not to use hyperboles, so that's high enough praise from me.
On the point of comprehension, I was fine with the short chapters and the few vocabulary of words or phrases immediately following each but what annoyed the reader in me, was the character prompts. The prose was almost free of extraneous writing (descriptions, thoughts, etc.), mostly dialogue. Each characters' speech was first labelled by name, in bold with a colon and then written out. It was like a script, whether or not this helped with comprehension, I can't tell you but it surely helped to kick me out of the story and jar my cadence, as I read the entire book aloud, to practice my intonations and fluidity.
I will say this is 3.5 Stars.