Barcelona gives you warm beach days right next to wild, sweeping architecture that looks like nothing else in Europe. You get Gothic alleys that open into sunny plazas, seaside paella, and Gaudi buildings that melt right into the streetscape. Late autumn is the sweet spot to go because the summer crowds vanish and the flight prices finally drop back to earth.
A typical trip runs about $3800 once you factor in flights, a place to stay, and eating well. Spreading that out over time makes it much easier to swallow, but you need a solid plan so you do not come home to a financial hangover.
The 0% intro APR is a deadline, not free money. If you still have a balance left when those 15 months run out, the regular interest rate kicks in on whatever is left over.