A company shows it's true colours when something goes wrong. How they deal with and solve a problem shows their quality. In this case, when something went wrong (the aircon not working) the response was a complete fail. A pity, as the apartment is basically a nice apartment with uncluttered decor and a good location.
On Saturday 15.08 around 20:30 I messaged the staff that the aircon was not working. I got no response for about an hour, so I called to follow up. The staff asked me to check the aircon in the apartment next door. I did so and informed that the aircon was also not working there . The staff member response was "We'll call technician tomorrow. Sorry for the inconvenience". The staff member offered no solution for the evening, accepting that I would have a sleepless night in the hot apartment. The staff member did not answer further messages from me.
An expression of regret, while nice, is not a solution. An appropriate solution could have been any of the following
1. "We'll send a technician around to fix it now"
2. "We'll give you a different apartment with working aircon tonight, and help you move"
3. "We don't have an alternative apartment with aircon available, we'll book you somewhere else with aircon tonight at our expense and help you move".
I contacted booking.com as there was no resolution. Booking.com customer service could not resolve the situation as the staff member only answered their phone once and did not provide booking.com staff with any solutions.
In order to avoid a sleepless night, I booked an inexpensive, small room with aircon at the closest hotel. As the property was in breach of contract by not providing aircon, it should pay for this. To date they have refused to do so.
I left next day.
My advice to other travellers: Book here at your own risk and peril. If things go well, then fine. If something goes wrong, my experience is that this company will not fix it. Certainly not in a pleasant way with a smile.