In Warsaw and other cities, commonsense precautions should prevail - don't flash large amounts of cash around, ensure the safe keeping of valuables, and the like. In rural areas, you'll need to take a few more precautions to save yourself time and hassle. Outside of Warsaw, you'll have a much more difficult time finding doctors or police. In some places, there won't be any gas stations or populated places around for many kilometers. So, you'll want to bring a map so as not to get lost.
talk
Being home to Warsaw, travelers here will find the most diverse population group of Poland in Mazowieckie and with that the most diverse collection of languages can be found here too. Naturally, Polish is the most widely spoken language, but following that, people will also find a multitude of Poles and foreigners who speak other languages such as English and German. Russian, Ukrainian, and Czech can be understood by a fair amount of Slavic language speakers. Some Poles will also be able to speak Spanish and French.