Having spent time in a number of hotels, I thought the subject was worth posting.
The best hotel you've stayed in? The worst? Why?
For me, the best, hands down, is the Marriott in Bethesda, USA. The standard is very high, the staff is courteous and helpful, and pretty much everything just works. I don't care if they are Mormons or not, they know how to run a hotel.
The worst is a toss-up between two worthy candidates. There is the mouldy Elmwood Hotel in London, and there's this place in Vasastan, Stockholm, that I have thankfully forgotten the name of that gave a whole new meaning to "disgusting". You don't want to know.
Surprisingly, the Marriott, while more expensive, is not THAT expensive. For example, I write this in a tiny room in a hotel called the Swinton that, assuming the price is directly proportional to the quality, should be about half as good as the Marriott.
It isn't. It isn't even close.