My two major peeves:
1) Foam pillows. I can't sleep on foam pillows. I've been in hotels that call themselves "luxury" or "5-star" that don't have feather pillows available. I pack my own pillow when I check a bag but this isn't practical when I go carry-on only.
2) I always request a quiet room away from ice machines and elevators when I make my reservation. I can't tell you how many times this has been ignored, requiring me to go back down to the front desk, asking to have my room changed, waiting, waiting, waiting when I thought I could just unpack and relax.
I know these aren't unique to me but I needed to vent.