I feel like this is an inappropriate construction for volo velle. I was taught that this verb requires a complementary infinitive. This sentence should perhaps use amo, amare
You raise a good point re subjunctive. Here's a critique of subjunctive as DL teaches it with such clauses: here https://forum.duolingo.com/comment/34000366 and here https://forum.duolingo.com/comment/33825939
Yeah - the English makes it sound like "You would enjoy this book" rather than "You want this book". Perhaps there should be a distinction.