Travel / Trip to Kraków for a week or more [4]

Hello you all Polish Bros.
im going to Poland for one week or a little more, im going to Krakow as main city and i have a few questions.
I`m in my early 20's so for sure ill stay in a Hostel, i made a little of research and i really liked this one greg and tom hostel , is it good ? , and i have two more big concerns, whis places are a must go there ?

and how im going to do with the chicks there, kind of good looking, not model looks or anything like that, just above the average bot not too far, an ok body complexion, im white.

Being like that, am i going to be able to get some luck there ?