Recently stayed in FS Prague, wasn't keen on the room and they were prepared to upsell us into a suite at a discount.

The Berkeley in London will undoubtedly have the most complaints on room allocation, as many floors have completely different themed rooms. I wonder just how they manage to deal with that.

Not quite the same as what this topic is asking, but when I stayed in The Metropolitan, Miami in their top suite, I just absolutely hated the room and the hotel. Looking at the photos on the website now, it makes it look so bright whereas the reality was more like someone was playing shadow puppets throughout the entire suite. Even though I was hardly there, after 2 nights I couldn't stand it any longer and phoned David O and asked if I could leave early without paying any penalty. I don't know what magical words he whispered to them, but it worked, so I went off to The Setai instead.