Definitely a) foam pillows, and b) a quiet room away from elevators, the pool or other noisy areas. Sometimes I will ask them to empty out the minibar prior to my arrival. It is nice to be able to have somewhere to chill a bottle of wine or cheese that I have picked up during the day without being confronted with the draconian "our sensors are watching you and if you move one thing, you will be charged" sign.

Also, if it is a hotel overseas, I always email the concierge in advance and ask them to make dinner and spa reservations for us.