== Ad links == 

 I do not think it is polite inserting ad links of private companies, such as e.g tourist guides, in the external links. At least they should be handled as information links; this is why it would be surely better inserting only the links to the official service lists, such as, in this case, the official list of the authorized tourist guides for Mantua http://www.turismo.mantova.it/index.php/guida. Of course, this should be true also for every context.