The hotels nearest to Conference venue are:
Hotel IBIS Warszawa Reduta RE (distance about 1,4 km)
https://www.accorhotels.com/en/hotel-7148- ibis-budget- warszawa-reduta/index.shtml

Hotel Campanile (distance about 2,4 km)
https://www.campanile.com/en/hotels/campanile-varsovie- warszawa

Hotel Metropol (distance about 3,9 km)
http://www.hotelmetropol.com.pl/en/metropol-warsaw- hotel-offers/default.html

We suggest to book a hotel room as soon as possible, since September is still a tourist season
in Warsaw.