ibis Budget Poland, $11.60 per night, dates into end of February
Credit goes to a Polish airline blog. No code needed, available on accorhotels.com. Make sure you check tripadvisor for pictures of how the (very small) rooms look like. List of available properties here:
Ibis budget Warszawa Centrum, ul. 1 Zagórna
Redoubt ibis budget Warszawa, ul. Battle of Warsaw 16
ibis budget Krakow Old Town, ul. Pavia 11
ibis budget Krakow Bronowice, ul. Army 11A
ibis budget Wroclaw Stadium, ul. Air 151
Ibis budget South Wroclaw, ul. 35A racing
ibis budget Katowice Centrum, al. Roździeńskiego 18
ibis budget Torun, ul. Fr Jerzy Popieluszko 2a
ibis budget Szczecin, ul. Prof. Louis Janiszewski 2