We booked two tours with Kraków Explorers: the Old Town and the Jewish Quarter. Our guide, Chris, was very kind, had a good sense of humor, and certainly was very knowledgeable about all the parts we covered. Not only did he explain the history behind, but he had also printed out pictures to show the places over the years.
He also had recommendations about places to see, bars, restaurants etc., and all were done over several QR codes he provided, with pinned places. He really went above and beyond, and just shows how passionate he is about what he does.
We definitely enjoyed our tour with Kraków Explorers, and we definitely recommend this to anyone visiting the city.