David Di Giacomo is a knowledgeable, kind and responsive guide who took us through the history of Pisa for two hours. Pisa is a relatively small town and he provides you the basics to continue on your own. His tour starts at the train station and conveniently ends at the Pisa tower, where he explains you the history, restauration works and the other monuments around. If you want to climb the tower, reserve and buy your spot at least a week in advance. I can recommend David's tour!!!