The "Ossa Congress & Spa" Hotel is located in the Ossa village, between Rawa Mazowiecka and Biała Rawska, next to the S-8 motorway, about 1 hour drive from Warsaw and its international airport.
Initially, hotel makes 500 beds available for PyCon PL attendees, with the option to increase the limit. Conference venue offers modern rooms with high **** standard and different types of accommodation (studios, appartments, etc.) which should satisfy everyone.
The best airport for landing in this case is Warsaw Chopin Airport (IATA shortcut: WAW). There is a bunch of buses to Rawa Mazowiecka departing from the Warsaw West railway station. When you reach Rawa Mazowiecka, change bus to Biała Rawska (via Lesiew, not via Babsk) or alternatively Grójec. The important part is that bus should stop in Wólka Lesiewska, because this is the final stop where you must leave the bus. Next walk along the secondary road with direction Biała Rawska. Turn left on the first crossroad towards the Ossa (There's a road sign indicating the Ossa Congress & Spa hotel location). After a few hundred meters you'll see the hotel by your left hand. You can find the bus timetable from Rawa Mazowiecka at this website.
The best way to get to Ossa is the S-8 motorway from Warsaw to Wrocław. The city of Rawa Mazowiecka is situated between Warsaw and Piotrków Trybunalski (A-1 highway). We leave the S-8 motorway on the "Rawa Mazowiecka" exit, not on "Rawa Mazowiecka Południe (south)" and choose the 925 secondary road towards the Biała Rawska direction. After about 9 kilometers in the Wólka Lesiewska village turn left towards Ossa. There's a road sign indicating the Ossa Congress & Spa hotel location. After a few hundred meters you'll see the venue by your left hand.