Prices of the hotels in Warsaw for the end of September start at around 125-150$/120-140€ per person per night. We recommend two hotels located within the walking distance (about 5 min.) from the conference site:
Nobu Hotel *****
MDM Hotel ***
Two more hotels with convenient communication to the conference site (about 5 min. walk + 3 min. by subway) are:
Polonia Palace Hotel ****
Hotel Novotel Warszawa Centrum***
Taking into consideration that end of September is still a busy season for these hotels, we recommend to book the rooms as soon as possible. Such a reservation can be usually cancelled without any extra charge.
A map showing locations of the conference venue and recommended hotels can be found here.