Before this book came out, I didn't really care about the Giovanni.
Then I read it, and they have been my favourite clan ever since.
The book is organized like all other clanbooks, with sections on history, unlife in the clan, templates, etc. However, Justin Achilli avoids the mistakes found in previous "splatbooks" and produces a coherent work which adds an incredible depth to Clan Giovanni.
Just be warned, there is "language" and smut and gore in this book (in fact, I'd rate this baby as Black Dog material), but ironically, unlike most of the aforementioned Black Dog material, it *is* mature, because it serves a purpose.
The bottom line is, even if you've never been a fan of the Giovanni, give this book a try. Like me, you might end up loving these sick Italian bastards.