I've stayed in over 100 Airbnb's including many in Paris, and this was one of my worst experiences.
When we arrived the apartment was freezing cold. It was February, and the heat had been off for a while. We looked everywhere for a thermostat, but found none. We looked in the house manual, but found no instructions. I messaged Gerard but didn't get a response. It was a very long, cold night, shivering in our clothes under the thin blanket.
Gerard responded the next morning with unhelpful instructions, and then after several more hours of freezing, he gave us enough clues to figure it out.
The heaters don't have a thermostat, you just select a number (the dial is hidden in back). So the temperature swings between too hot and too cold through the cycle of the day and night. I'm sure if you lived there you'd learn the peculiarities of the heating, but for a short stay it was just very uncomfortable.