I am an owner of this property at West 57th by Hilton. You can reserve ANY nights of your choice, and depending on the days, the price will be from $319 - $389 (taxes, breakfast, afternoon snacks, wine/beer reception all included) per night.
This property is right across from Park Hyatt, but at a much cheaper price. Rooms are 355 sq ft. large! Great Value (based on my reviewers, really).
Please reserve at least 20-30 days in advance, as this place is usually booked.
Have a great stay in NYC!