We took all 3 "free" walking tours in Krakow with the same guide - he was great! The tours truly are "free" but come on - at the end of the walking tour make sure to tip these guides well if they do a good job - which our guide did.
We also did the free walking tours in Warsaw and Wroclaw which were good as well. We were able to maximize our travel dollars by taking advantage of these tours and then just branching out to explore on our own.
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