Italy in the shoulder season gives you the ancient ruins and the Amalfi coast without the August heat and the shoulder-to-shoulder crowds. Spring and fall bring mild weather, cheaper flights, and actual room to breathe while you take in the history. You get the real experience instead of just shuffling from one tourist trap to the next.
When you are looking at a four-thousand-dollar price tag for flights, hotels, and food, spreading out the payments can keep your bank account from panicking. That is where using the right card comes in, as long as you have a strict plan to pay it off before time runs out.
That 18-month window is a hard deadline, not free money, and any leftover balance when it ends will trigger regular interest charges on what is left.