I was recently in Frankfurt. The Hotel in the city ONLY had heat, no AC. I get that its Germany..but still, in the middle of summer it's hot.
What bothers me more are those hotels where the air conditioning is motion activated. Fine if you are awake in the room, moving around..but when you go to bed, it stops and begins to get hot. I have run into this in Las Vegas a few times and even in Tucson, which is simply cruel.