More than you'd think in Warsaw.
But only Warsaw ime.... and even then restricted to certain areas (esp a square kilometer or two radiating out from Centralna).
They exist in other cities but in much smaller numbers... where I live a problem in winter is getting them into homeless shelters (which have unused beds) because they can't drink....
a lot of "hidden homelessness"
That's in a lot of places... years ago I saw a documentary on homeless women who weren't officially counted as such (couchsurfing among friends, living in a care, that kind of thing) and these were women who had been middle to upper middle class (so they didn't qualify for any kind of social help). Rough.....