is there a coin operated laundry machine in the hotel
No.... you need to ask reception for laundry service.
The Hotel has a laundry service which is expensive for Indonesia. There I no machine with coins etc.
What we did was going into Rantapao town to w local laundry. Excellent service, price per kilo very reasonable. Near the market in town.
Get an answer from Toraja Misiliana Hotel staff and past guests.