Warning! Seems to be a sex-trap. Called to Margo who asked me to come to address Koptevskaya. When I finally arrived there she didn´t tell me which door to enter. Just a lot of bla, bla...
In Russia, all escort websites are blocked. Use anonymizers to access them. Our recommendations: Tor Browser (Win, OS X, Android), Onion Browser (iOs). Install it before go to Saint-Petersburg.