There are several hotels in the proximity to the CWGM venue:

Golden Tulip Warsaw Centre
http://www.goldentulipwarsawcentre.com/en

Hotel Premiere Classe Varsovie
http://www.premiereclasse.com/en/hotels/premiere-classe-varsovie-warszawa

Campanile
http://www.campanile.com/en/hotels/campanile-varsovie-warszawa

Radisson Blu Sobieski
http://www.radissonblu.com/sobieski-warsaw

Marriott Hotel
http://www.marriott.com/hotels/travel/wawpl-warsaw-marriott-hotel/

Polonia Palace Hotel
http://www.poloniapalace.com/default-en.html

Metropol Hotel
http://www.hotelmetropol.com.pl/default-en.html

Novotel Warszawa Centrum
http://www.accorhotels.com/gb/hotel-3383-novotel-warszawa-centrum/index.shtml

Hostel COCO
http://www.hostelcoco.pl/en/

 

 The SITUATION MAP containing hotels mentioned above can be seen in here:

 https://www.google.pl/maps/search/hotele+warszawa+mapa/@52.2264323,20.9889461,15z