This is certainly a well written book and a decent translation, although you'll have to forgive the odd discrepancy - the term 'Fusilier' is frequently used instead of 'infantry'.
As a primer, it doesn't have enough detailed maps, but you should be able to get by with the ones included. However, the author does give clear explanations of the arms and their roles and is quite explicit as to the location of various formations during the battle.
I didn't detect any significant bias - all nations were given a fair summary, which is a change from the now fashionable attempts to prove that the very few British troops who actually made it in time for the game were drunk, incompetent or cowardly and they were all Irish anyway. The German and Netherlands units aren't all hard done by, the Prussians aren't infallible supermen and the French aren't all Hollywood heroes making a last stand.
If you're a history buff and familiar with the battle or you're just curious, this is a very good read. It's not a seminal study and doesn't claim to be, but it does give a decent account of the battle and interesting insights into the main characters.
If you're thinking of buying it, do so: it's an entertaining read.