I didn't get this book because I'm struggling with my prayer life but rather it was free. Regardless of that, it's made me rethink my prayer life, how I'm doing it, what I can work on and what is doing ok. It's also given me some techniques and considerations I hadn't even thought of before, in terms of meditating on some of the short prayers in the Bible: "Lord Jesus Christ, son of the living God, have mercy on me, a sinner".
I would also recommend it because while it does use big words and Christian jargon, it also explains what they are, words like intercessions and mediation, which I think is really useful. For a new Christian, there's a lot to learn and hopefully they'll be enthusiastic to learn, but if they can have a short guide to starting to prayer that also explains Christian jargon, then so much the better.
All in all, a good starting point, or even a good book to come back when your prayer life is feeling dry or is struggling.