I shall just post on this passage, quite near the beginning, which made me smile.
'A variety of maps was on sale. The least significant were produced by commercial interests and, besides showing the more obvious tourist attractions, they gave great prominence to certain shops or restaurants. These maps were marked with the principal streets only. Another map was in the form of a badly printed booklet and it was easy, Mary and Colin had found, to get lost as they walked from one page to another. Yet another was the expensive, officially sanctioned map which showed the whole city and named even the narrowest of passageways. Unfolded, it measured four feet by three and, printed on the flimsiest of papers, was impossible to manage outdoors without a suitable table and special clips. Finally there was a series of maps, noticeable by their blue-and-white striped covers, which divided the city into five manageable sections, none of them unfortunately overlapping.' Ian McEwan The Comfort of Strangers
How is your map of Venice?