Sadly the apartment is moldy. (rain dripping from the ceiling = cups placed to hold the water), unbearably moldy smell and wet walls from the inside.
The host called us a few hours prior to arrival and spoke of a storm in Porto (there were common heavy rains just like every October/November) and mentioned the apartment was in a poor condition.
Interestingly enough there was no news of storms, flooding or heavy rain (after living in Porto for some years we are very well connected in Porto and read the news: none of our friends had any issues or new of anyone who did).
Apart from the mold unfortunately the apartment was not clean (I.e. toilet, kitchen, floors). There also were bugs but to be fair having to spend the night in a moldy place was the bigger challenge. The apartment has potential and it’s a big shame it did not work for us.
The hosts solution was to use an air humidifier and electric heating and it will all be fine. We had to escalate the case to the Airbnb resolution center and booked a new place after spending a couple of hours in there. If we would not have had arrived at 1am in the middle of the night, we surely would not have spent the night and had immediately left.