Update after actual travel: My initial opinion is unchanged - this book has some useful information that is not in the Rick Steves guide, but overall I think Steves is slightly better (but the difference is marginal, so if you have a Kindle Unlimited subscription I think you should just use this book, and I don't think anyone needs both). The information in this book is fairly current, but the costs data, given the sky high inflation of the last couple of years, is out of date.
This is a review of the Kindle edition, which is dated 2019.
I'm using this book (which I'm reading using a free trial of Kindle Unlimited) to draw up a rough itinerary for an extended trip, I will buy the Rick Steves guide before I start making bookings - in my experience Steves is generally better than LP, but he's highly opinionated and he only covers things he's interested in, so it's good to consult a 2nd guidebook, particularly for a long trip. This book is very thorough, covering a wide variety of destinations, and of attractions in each destination - so, given the above, I'm satisfied with it.
The formatting of the Kindle edition isn't great (some sections are simply unformatted, though this is less of a problem than in LP Spain, which is dated 2018 - hopefully this means LP editors are learning how to create a Kindle version properly!), which makes the book hard to follow, as well as looking ugly. The links to Google Maps would be awesome if they worked properly, but often they don't (they often take you to the lat-long, rather than to the pin for the actual attraction). The links to websites do work and are very handy. The search function is very handy too. Kindle is the sensible way to carry a guidebook (who wants to lug a huge brick around the world?), so it's really sad that there are many kinks in this Kindle edition.
As I always do when reviewing travel guides, I'll update this review after I travel (which probably won't be until 2023).