I'm a French native speaker living in Warsaw for a few months now. I don't speak Polish (yet, I'm learning...).
The best method is immersion, it's also my favourite one, but we can use English as well, of course.
No matter if you're a beginner or a more confirmed French speaker, I can help you to learn or improve French language.
Regarding where the classes may take place, there again, it doesn't matter, it might be my place (Ochota), yours or a café.
2001 - CAPES ( French Teaching Degree ) IUFM Strasbourg (France).