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. Self-check-in to the apartments is via electronic locks. Guests are given codes for the locks remotely. Contact with the apartments must be established at least 1 hour before check-in by phone. Check-in is possible 24 hours a day.