I went there with friends. One of them is Russian and she said it's quite authentic. I ordered soup, rolls and beef dumplings. The soup is served with sour bread. I didn't know that, so, I tried sour bread without soup and it is truly sour (lol). But when I ate it with soup, it tasted so good! I like the flavor of the rolls too. But, the dumplings are just normal.
The service and ambiance not bad. If you want to try something different, maybe this small, cozy, Russian restaurant is a good choice.