I stayed in a hotel on a Greek island and one morning I found a cockroach (alive) in the shower; later that day I spotted a dead one on one corner of the hall.
It was pretty clear that the hotel had some problems with these insects and it was also clear that they were actively addressing the problem since they cleaned the rooms and the shared areas quite often.
In the end, since I found only one in my room I decided to avoid complaining but I wondered if there exists some laws, expecially in western countries, that apply to this case or a standard way in which the hotels and the customers cope with this problem (refunding, having a new room, etc.).