We rented apartment for 4 nights.
Apartment has a mold problem in downstairs and we could only use upstairs. Especially one bedroom smells really bad and has visual mold behind beds headboard. When we checked in there was strong smell of detergents what first covered mold smell.
We made the sofabed for the kids because it was impossible to sleep downstairs.
Renters solution was to ventilate or use humidifiers. They knew about mold issue, but said that it is only minor problem and apartment is habitable.
In airbnb site there was no customer rewiews conserning mold. But after this incident I found another bookings site and there was several mentions about mold smell in this apartment.
We stayed only 1 night and went to a hotel. We got back 3 nights. Renter still thinks that downstairs is habitable and gave us money back only because we did not feel comfortable.
We think that this apartment should not be rented in this condition. Hopefully owner will solve mold problem in a sufficient manner.