January and February are the quietest months in New York City, which means hotel rates drop to some of their lowest points all year. You get shorter lines at top restaurants, easier access to Broadway tickets, and a city that feels a lot more livable without the summer crowds.
Spreading out the cost of a trip like this can make it much easier to handle. If you are looking at paying over time, the Citi Simplicity® Credit Card gives you 0% for 18 months on purchases and balance transfers from date of account opening to clear the balance without adding interest charges.
That 0% window is a hard deadline, not free money, and any remaining balance left when it ends will start racking up standard interest charges.