We arrived at the hotel at Nice and the air conditioning was broken (air
conditioning was the main filter we applied when looking for hotels this
summer). There was a fan at the room.
We asked at the front desk to fix it. He sounded surprised, said it was all working but would look into it while we walked around town.
When we got back, the same clerk insisted it was working, and the compressor only needed a little while to really kick in.
We got to the room, it was still hot. Another male clerk went to the room, looked at the air conditioning, tried cleaning the filter and asked us if that worked.
When it didn't, he offered us a free breakfast for our troubles and said he would either call a mechanic the next day or provide us with a portable air conditioner. The mechanic would have to wait as it was already too late. He also provided us with another fan, which did next to nothing to cool the room.
The next day, after a horrible sleep, we went to the front desk. A female clerk told us she received a memo from a colleague explaining the issue. She wouldn't show us the memo to check for accuracy ("it is in french, you wouldn't understand" - even though I currently live in France, spoke to her in french and stated I would understand it). She continued to say they could provide us with another fan, and that they saw that the air conditioning was working (they would call someone to clean the filter, that would resolve a problem indicated by some blinking red light) but slowly. She suggested we should have left the window closed in order for it to work (we did), that the mechanic could not fix the problem that day. We then went back and forth as she either denied the problem ("it is working, only slowly") or offered to provide us with another fan.
We could not sleep there another night, but were positively surprised when she accepted our request for a refund. We got a refund of the two nights missing in our booking.