I have spent a lot of time in Russia, and later this month will be moving out there to live and work.
I am pretty good at speaking Russian (not fluent, but will get there soon), which helps of course, however, based on my experiences you would be better of asking a taxi driver to take you to a tochka, rather than gamble on rusdosug.
In Moscow I did this a few times, and was taken once to an underpass where 20+ girls were paraded in front of me, pick the one you want, then go. A lot of girls from provincial Russian / Ukranian cities, and as you would expect, Moldovan's etc.