During the online booking process, you will be asked to fill in a form with all your personal data and your tax code. The tax code is not mandatory at the time of booking, but you must necessarily have one at the time of signing the contract during check-in. You can request it yourself or they can help you with the request against the payment of €60.00. This information is essential for the drafting of the sublease agreement. All the information and documents that they ask you are required by the Italian State to register your contract.