Translation:I work in Germany, although I live in Poland.
Take a look at this map: https://pl.wikipedia.org/wiki/Rodzaj_gramatyczny#/media/File:Polish_country_name_genders.svg
Red is feminine, blue is masculine, yellow is neuter, and green is plural.
Be careful though. You are probably health-insured only in one country. In case of emergency, "your" ambulance won't cross the border (despite Shengen), so you would need to either call it to the border and cross it on your own, or pay extra for medical care where you aren't insured.
Definitely between Szczecin and Berlin, but also with further distances to take. I am from Hamburg and there are quite some people from Gdansk (>700 km) working here during the week and driving back home to their familiy only on weekends. I sometimes drive to Poland by 'rideshares' with polish people over the weekend and from Hamburg to Szczecin, to Bydgoszcz, to Poznan or even to Gdansk are always several opportunities to find.