Air conditioning didn't work in our room. It was 30+ degrees outside, so the room was really hot. Staff gave us different answers, like
"We can set it from here, if you go to the room it will be better within an hour"
"It's broken in all the rooms, there's nothing we can do"
"Here's my manager's number if you wish to complain"
None of these actually helped. We were not offered a new room, or even a fan or portable AC. Nothing.
When checking out a man handled our checkout. He was very service minded and did all he could to compensate. Nothing could be done about the warm night, but he did what was in his power and that was appreciated.
We had the same problem with the AC in another Premier Inn, in Lubeck, but there we were offered to switch rooms.