So who addressed this "guide"? I would say the same to readers (a little more) to viewers (a little less). If you've read the book then you end up with joy a number of characters mentioned throughout the volumes, and flexible writing, simple but melodious GRR Martin (Marcel P. and of course quality of the translation). If you are fans of Game of Thrones, it will be a good opportunity to discover the history, myths, legends, heroes who marked Westeros and thereby the series.
If you are a reader and viewer, do not hesitate. If you are hardcore fans, I do not speak to you, you've probably bought.