Search people having experience with VISA for cohabitation

Hello,
I am Belgian, working in Brussels and living in Morlanwelz.
My girlfriend is russian and we have plan to live together.

I would like to enter in contact with people (couples) having experience in the request of VISA for cohabitation.
If some people have in the past follow this process, can I take contact with you for some practical questions ?

Thanks in advance,

Jean-Christophe

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