Accomodation how to get here
Short term accomodation suggestions:
You can easily find a hotel in Warsaw by booking.com or similar. Below we include a few less known options for consideration.
IM PAN itself has a few guest rooms (without breakfast), consult http://www.impan.pl/en/insitut
the hotel nearest to IM PAN is MDM Hotel http://www.hotelmdm.com.pl/def
OSiR hotel (located at Polna 7a) is less expensive than usual hotels (has multiple options such as with/without breakfast, with private/shared bathroom), it has no english website though http://www.osir-polna.pl/pl/ho
A swimming pool and other sport utilities (non-free) are located in the same building.