Morocco, lone student trip, horrible filthy room, bedbugs! (Get bar of soap a bit wet, turn on light suddenly, slam down the soap on the things and they stick.)
Spain, cockroaches big enough to kick you to death. Not worried, so let them wander about. Horrible crunching sound when you trod on one with bare feet though.
Travelodge, Leicestershire, dirty smelly bedding not been changed. No-one on duty so slept on floor.
Senegal, out in the bush, lone trip, no electricity, plastic jug to wash myself with well-water, mozzie net so no bites, spotlessly clean and slept like a log.
So, it can be done, if the proprietors have standards.