My favorite Marriott property in Manhattan is also the Essex House. It's right on Central Park South and is a real NY landmark. It has a great executive lounge that will save you a ton of money on breakfast and snacks in NY. You can easily walk to Times Square. Marriott Marquis is right in Times Square and is huge and doesn't have the character or class that Essex House does. I don't like MM at all, but others do. It's ok if you want to be right in Times Square.