Smell that makes you feel bad (mold or sewage?)

Smell that makes you feel bad (mold or sewage?)
Windows do not open (cannot ventilate)
The whole facility is very old (Is it earthquake-resistant?)
The price is too high
I felt it was impossible to spend the night in the smelly room and checked out in less than an hour after arriving. Although I knew 100% of the cancellation fee, I was charged after returning home without any explanation up to the + 50% fee of the scheduled late checkout. You should use another hotel around the airport.