We found Olga via a Tripadvisor forum and she took us for the day to Catherine's Palace and Pavlosk. Olga was very thorough and professional in confirming to us via email ahead of time and she was on time on the day. She is very knowledgeable about the history of St Petersburg and her English is perfect. We had a great day and I would not hesitate to recommend her services to other visitors to St P.