I stayed at the Heathrow Renaissance on an employee friends and family rate. The first night, the air conditioning did not work in the room, and they were full, so they apologized and asked that if it's not too much of a hassle, to stay in the warm room for that night, and that they'd move me in the morning. Apparently the evening front desk clerk did not leave a note about it, so when I spoke to the front desk again the next morning, they had no idea.

They rush cleaned a few rooms, and gave me an upgrade to a runway view room with better amenities (remember, I was staying on an employee friends and family rate!) and let me pick which room I wanted from the ones that were just cleaned.

I thought that was a very nice gesture! The rate was non-earning of course, but apparently all of my room service meals and room charged meals at the restaurants earned points (so now I have orphaned Marriott points).