On the top of my list is IBIS at AMS Amsterdam Airport.
I had an "red eye" flight very early in the morning out of AMS. I was looking for a reasonable priced Hotel on the Internet, found this IBIS, nice pictures etc. I did not expect anything fancy, just sleep a couple of hours. This Hotel feels like a well organized jail. They used the cheapest stuff you can find on the market. Very small rooms, old and shabby. I really felt bad.