Maybe someone told you Porto was "just a wine city." Maybe you were planning to tick off the Ribeira, sip one glass, and move on. We're here to tell you, very kindly, that would be a wonderful mistake to make — as long as you stay a little longer. Porto is one of Europe's most quietly romantic cities. It doesn't announce itself the way Paris does. It doesn't try to impress you. It just pulls you in — with its cobblestone stairways tumbling toward the Douro, the amber light th