Late autumn in Lisbon is perfect. The summer crowds have left, the light hits the blue tiles on the buildings just right, and you can actually hear the ocean. It is the best time for long walks along the coast without the heat.
You do not need to save for two years to afford this. If you use the Citi Simplicity® Credit Card, you get 0% for 18 months on purchases and balance transfers from date of account opening. This lets you spread that $2100 cost over time.
This 18-month window is a deadline, not free money. If you have any balance left after the 18 months are up, you will start paying interest on what you still owe.