one room apartment of 35- 45 m2 ? electricity, water usage, garbage, internet etc.
if you want to live in the heart of the city that would cost you atleast 1600PLN all inclusive.
But if you want to live like 10mins bus/ tram journey to the Mainsquare, that could cost you around 1400pln all inclusive. and you will have your own studio..
Visit gumtree.pl you can find studios there and you will get an idea.
Travelling is cheap here. 89zl for a monthly bus/tram pass all lines included. however, HCL is in zabierzow, so maybe an extra train ticket would be required.