I would strongly recommend the Auschwitz Birkenau Private tour if you visit Krakow. Peter our driver was very polite, professional and knowledgeable. His enthusiasm about his country was lovely to see not only did he advise on things we learnt a lot about Poland and Auschwitz. Peter added lots of little touches like helping us get in , sort the radio headphones and even got us a lunch so we could eat in his car on the way to the 2nd camp as you only get a 15 min break between the tours. The car was a modern BMW which was comfortable , Peter also drove very professional no speeding etc. We will return to Krakow and request Peter for the Salt Mine tour as well because we run out of time.