Here are some hotels in the vicinity of the conference venue:

EasyHotel Nice Centre des Congrès, 2 stars (https://www.easyhotel.com/hotels/france/nice/nice?utm_source=google&utm_medium=organic&utm_campaign=GMB-owned-nice-palais-des-congres):

                  38 Rue Barberis, 06300 Nice

                  Tel.: 0492002121

                  A night for a single room is 60€ on 23rd January

Hôtel Relais Acropolis, 3 stars (http://www.hotel-relais-acropolis.com/):

                  20 Bd Risso, 06300 Nice

                  Tel.: 0492001450

                  A night for a single room is 70€ on 23rd January

Nice Pam Hôtel, 4 stars (https://www.nice-pam-hotel.com/):

                 26 Rue Smolett, 06300 Nice

                 Tel.: 0493891888

                 A night for a single room is 90€ on 23rd January