The Impertor was a strange restaurant, mainly because we were the only people in it. The DK Travel Guide states the following:
The Strelka has a number of restaurants but none of them can match the Imperator for price. Tucked away in the basement of the Academy of Sciences, next to the Kunstkammer, it serves the usual mix of European and Caucasian cuisine, with the slightly odd addition of Mexican dishes. The small non-smoking room should be booked ahead.
The first part is certainly true – the prices were very reasonable. I’m not quite sure what ‘Caucasian cuisine’ entails but the menu was certainly very varied. The meal itself was pleasant, if not exceptional, but the service was fantastic. We had already eaten a few times since arriving in St Petersburg and the service had been pretty poor each time.