A pleasant and very pretty city with friendly people and GREAT food, we used it mainly as a home base while we traveled to visit Auschwitz. Every meal was delicious, and even though it was cold we had fun shopping in the main market square and taking a carriage ride around some of the major sites.
Insider Tip:Go to Auschwitz and Auschwitz II Birkenau. It is something everyone should do if able. A life-changing experience that will transform the way you think. Eat pierogi. They're magical. Also eat kielbasa and cabbage rolls. Go shopping in the Stare Miasto.