The private tours are reserved for the traveller who wishes to enjoy the service at his or her own pace, determining the level of commentary directly with the tour guide. It is possible to choose the precise date as well as, within certain limits, the schedule of the tour. Furthermore, after the tour begins it can be adapted at any moment by changing the quantity of instruction or even the itinerary. The cost of the private tour is set, allowing for a maximum of six participants. Each extra participant must pay an additional fee in order to cover the tickets and administrative costs.