The book can be devided into two parts, according to the city. Orwell's account on Paris provides the reader with a very detailed description of the life of dishwashers as well as waiters. Here the reader will be introduced to the hard life behind the kitchen doors.
The latter part on London focuses more on how tramps would move from one place to another in search of food, as well as on sleeping accomodations. It is in this part that Orwell discusses his take on the problem concerning vagrancy. He attemps to undo the "tramp-monster" myth as well.
Besides the illuminating details of uptight life, Orwell tries to propose a solution for ameliorating the conditons of tramps in the final chapters.
With all the accounts on poverty, what makes this book enjoyable if not amusing is the well-thought tone, between serious and humorous, which Orwell uses so skillfuly. Given the considerable amount of French in the Paris section, knowledge of French would be helpful.