https://www.russia-italia.com/viewtopic.php?f=58&t=3186&p=6614218#p6614218
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Alred
04 Luglio 2008, 0:19

Re: Registrazione Visto
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[b]Can't Find Where to Register. [/b]

Description: What if you're not living in a hotel and the agency that issued the invitation for your visa doesn't have an office in Russia? (it means they fucked you up in a way...) 

Reason: This situation may happen if you made your tourist or business invitation through a company that doesn't have an office in the city you're in, and you decided not to live in a hotel, but to live in an apartment or with your friends. It's not a big problem. 

Solution 1: Contact the travel agency, explain the situation, ask them what to do. Most probably, they'll make a special letter to UVIR (immigration officials), which you will then need to bring to a local UVIR office. This option is the most legal and cheapest one, but also time-consuming.

Solution 2: [u]You just go to any hotel (the cheapest one), buy a room there for one night only, and ask stamp a registration in your passport for the whole period of your visa. Not that they're obliged to do it, but they can. If they don't want to (for example, because you pay for 1 night only), try to persuade them refering to Federal Law #115 (26/07/02).[/u]

In poche parole, qualunque hotel andrebbe bene, a prescindere da quello indicato nel voucher.
Certo che se leggono che tu ci debba stare in russia 7-15gg e da loro non vuoi dormire, o al massimo una notte, è ardua convincerli a registrarti. Ma POSSONO.

qui c'è la Legge russa sull'Immigrazione.
Chi volesse tradurne i punti salienti.. :wink: 
http://www.rg.ru/2006/07/20/migracia-uchet-dok.html