New York is a fantastic place to live - as a city in the US it is without a doubt perhaps the most culturally diverse place int he country, has world class museums and night life, restaurants, activities for families, couples. Pretty much anything you could want, you can get.
Negatives - you'll pay through the nose for everything. Live in a tiny apartment. You really only get good weather about 3 months out of the year (end of spring beginning of summer / beginning of fall).
Gotta have the pluses and the negatives.