3 days and only 1 in Cracovia - that's almost a crime, while this is one of the most beautiful cities in Poland. Varsovia is quite nice to, until you're not going sighseeng. One day should be enough for this city(I'm sure citizens of Varsovia are already looking for me with blood lust in their eyes
). But if your going in buisness matters, then two days in our capitol city should be ok. Most beautiful Poland is during spring - May/June, or in autumn - September and October, mostly in mountains, today, at the end of the winter it can dissapoinyting - cold, rainy and dull.
About yataghans - Iwill ask around, but it's not popular weapon in Poland, personally I don't know anyone who collect such weapons, so that what you can find in here are mostly average in quality pieces, if there are!
When are going on the trip?