NOT RECOMMENDED AT ALL IF YOU DON'T SPEAK RUSSIAN
Everything is in Russian. The guide offers a brief explanation in English for less than a minute, then switches to Russian for about 10 minutes (despite his effort to accommodate us). The audio guide also provides a short explanation, but with a heavy Russian accent. Tickets are 4000 rubles per person and it's NOT WORTH IT. When we complained, the manager was rude but agreed to refund 1,000 rubles per person.