Luxury Hotels in New York
The Plaza is in my opinion a great hotel in NYC. Plus, they often offer a 3rd night free (currently being offered thru Nov 16) which makes it a great value.
I find a free night special is a terrific value at any hotel b/c on a typical 3 night stay it's equivalent to 33% Off.
Many hotels (including most Four Seasons properties) have routinely offered free nights well before GroupOn (and others of its ilk) became popular.
Plus, when you can get additional perks like free breakfast for two COMBINED with the free night, the value-add is impressive.