In addition to the above posts, ROW in NYC is also a good hotel. Completely refurbished and great on line rates. It's right off Times Square and next to Restaurant Row. When you go to the 911 memorial, be sure to check out Trinity Church as well. Depending on how long you will be there and what activities you plan to do, look into the New York City Pass. We saved some money with it and the line skipping is nice depending on the time of year. If interested in shows, the TKTS booth in Times Square and the TKTS app can save money on same day tickets for shows on and off Broadway.