The requirements for documents needed at check-in depend on the type of accommodation and the applicable regulations. For hotels and other accommodation facilities, a Russian passport, an international passport, or a driver’s license may be accepted. For apartments, serviced apartments, and other properties where check-in or contract conclusion is carried out according to the rules of a specific property, the required documents are determined by the property itself. For accommodation in a sanatorium, a certificate of absence of contacts with infectious patients is required, valid for 3 days. Guests may contact the property for details, contact details can be found on the booking confirmation.