In particular, the selection covers the sub-sample of the historical center of Milan, with all the 57 hotels present at that time in booking.com. We chose 16 different check-in dates in October 2012, equally divided between intra-week and weekend. The month of October was selected to avoid contaminations of bank holidays on the attractiveness of a particular date. We gathered price information about these specific check-in days starting from July 2012, to detect as much as possible eventual variations in prices and other (tactical) attributes. In particular, the process of booking was simulated 26 different times in advance for every single of the 16 different check-in dates, always collecting the cheapest price of a single room, if available.