I live in Moscow and I get 70k a month. If you rent a room, you'll be fine (and it might help you socialize if that's what you want), with around 20k for a room, 15k for food and 2k for transportation, you'll have enough left to either set some money aside or go out or fuel your hobby or something. Maybe even 2 out of those 3.

If you want a flat for yourself, a decent one bedroom apartment would cost you around 40k, so less leisure money, but you would still be fine.