It made my day. Marina guided me to a couple of contemporary galleries, then to the Russian Museum, to see some modernist paintings, and then she left me at the door of the Ermitage (with some useful tips) which also held the Manifesta exhibition,. I had a day full of art, with Marina's kind and (very) knowable guidance. If you like art, go for this generous tour.
Best experience! Don't try to walk all St. Peter by yourself if you are here for just a couple of days, it can be exhausting... But with Artem's excellent guidance and his bike tour, you are all set for future explorations. He is smart, and will tell you a lot of "real" fun stories about this city!