Hello Szymon,
this seems to be good news. Not long ago, I went with Sabine, my wife, on a tour from Krakow along the "via regia" with the little workaround of the region of Zakopane to Katowice and all the way to Breslaw. The quality of the descripted "velo route" was sometimes rather a wish than a real bicycle way.

Nevertheless did we like your country and your fellow polish people very much.

Happy new year, Jakob