Submitting good feedback on the hotel to Mr. Marriott's office is a great idea.

I would also recommend that if there are specific staff at the hotel you would like to recognize, you do so via letter to the GM. This way, a copy of the letter will go into their personnel file, and they may receive additional recognition from the hotel, i.e. cash award, paid time off, gift cards, employee of the month plaque, etc.

Regards,

RIP...