I read this in Italian translation, without all the editorial folderol, which may be very interesting, but...
Casanova's imprisonment in the Palazzo Ducale, top floor, is very interesting for a Venetian visitor. How he escaped is equally interesting, and terrifying to one who has seen the place.
Italian prison life in the settecento, the occasional fellow prisoners, etc, has a fascination for the modern reader--compare, for instance, imprisonment in the Tower of London for Renaissance aristocrats and royals. Casanova's eventual escape was made possible by his not being the sole prisoner, as I recall. I read this two years ago in Italian, so only the essentials remain.