Please note that you have to book your own hotel. The conference committee will not help book a room for you. The Conference is at:

SINTESA PENINSULA HOTEL (★★★★★)

Jl. Jendral Sudirman, Gunung Wenang
Manado, North Sulawesi
INDONESIA
Phone: +62 (431) 855 008
http://sintesahotels.com/explore/manado/sintesa-hotel/home/

However, there are plenty of hotels nearby with varying room rates.  Among them are:

ASTON MANADO HOTEL (★★★)

Jl. Jendral Sudirman No. 128
Manado, North Sulawesi
INDONESIA
Phone: +62 (431) 888 8989
https://www.aston-international.com/eng/hotel-detail/34/aston-manado-hotel

SWISS BELHOTEL MALEOSAN MANADO (★★★★)

Jl. Jendral Sudirman No. 85-87
Manado, North Sulawesi
INDONESIA
Phone: +62 (431) 861 000
http://www.swiss-belhotel.com/en-gb/swiss-belhotel-maleosan-manado

ARYADUTA MANADO HOTEL (★★★★)

Jl. Piere Tendean (Boulevard)
Manado, North Sulawesi
INDONESIA
Phone: +62 (431) 855 555
http://www.aryaduta.com/manado/

GRAN PURI MANADO HOTEL

Jl. Jendral Sudirman No. 458
Manado, North Sulawesi
INDONESIA
Phone: +62 (431) 822 888
http://www.granpuri.com