What sort of free stuff are we talking about here?
In general various social benefits. I have no idea to which you will be entitled to as a foreigner who pay taxes here, but what I do know is that there are famillies who have less than 4K gross and have to much to get support.
Free stuff like for example kindergartens. If you pay taxes in PL maybe even as a foreigner you could apply for a place for your child there, but because there is not enough of places you will have to wait in line...
You mentioned about cheap city apartment rents? What is that?
The city has some amount of flats which can be given for a very low rent on social basis. But don't bother with that. People waits for years to get that - and usually those are not pretty places.