I spent approximately 25000 – 28000 roubles (385 – 430 $) in a month including living and shopping costs
My group consisted mostly from exchange students, so it was easy to fit in the environment. But I’d suggest learning some Russian before coming. And the most useful thing I learnt about staying in Russia – giving up doesn’t help, be preserving, and, finally, everything will be fine. As to everyday life I ate quite often in restaurants, went to a fitness club, and, of course, made many trips to explore Saint Petersburg and other interesting places nearby. I would say that in total I spent approximately 25 000 - 28 000 roubles (385 – 430 US dollars) in a month including living and shopping costs.