According to the new tourist service conditions that come into effect this year in Russia, arriving early before the scheduled time could be considered a service to be charged for.
There will also be a change with regard to lost belongings in hotels. Administrations are no longer obliged to keep them poste restante for six months, in order to dispatch them upon request.
The extra storage policy for lost items will be different at each hotel, and uncontrolled by common rules. It is therefore well worth checking them before arrival.
On the positive side, during celebrations and holidays, hotels will not be allowed to change their prices much; increases will have to be verified in advance.