the city is probably Bielsko-Biała
http://en.wikipedia.org/wiki/Bielsko-BiałaMatejko is a very well known name in Poland thanks to the XIX century painter, Jan Matejko. Kosloff looks like a transcription of a surname Kozłow or Kozłów (for me it sounds more Russian than Polish, but with the multi-cultural Poland before WWII, everything was possible). Kozłów would be (in Polish) rather a town/village name than a surname. Popular name derivated from Kozłów would be Kozłowski (quite popular in modern Poland).