I was travelling for a month and a half around Europe, and I have to say that Krakow is the city that I loved the most. It is really beautiful, its architecture is amazing, the colors of its building surprised my eyes all the time. It is a really great city to chill and also has a lot of history. I would definitively come back.
Insider Tip:A tip for traveller would be to contact locals from Krakow through couchsurfing because they know a lot of things about the city that don't appear on the internet.