We liked the accommodations. It is very convenient, clean and family friendly. 6 people can easily sleep here.
The apartment is, however, not designed for warm weather. We got there at midnight and it was baking 100 degrees. We opened up windows, balcony and turned on 4 pedestal fans to cool the place.
I think because it is the top apartment all building heat flows up. It was much cooler downstairs.
Anyway, I sent a message to the host asking if they had an a/c unit , (knowing the answer) and they said they did not.
All this is not the fault of the host. They don't control the heatwave in Europe. Nor lack of air conditioning in the entire Switzerland. Which is why it does not reflect on my rating.
I just want to warn travelers not to be in this particular apartment during a heatwave.