I thought Barcelona was pretty good as a young person. Beware of pickpockets - crazy amount of stories and they're really good down there. Probably more pickpockets than anywhere else in Europe. Valencia is a must do. Good nightlife, very very safe (no pickpockets), and just a nice city/town. I did Seville and was disappointed. Hot AF, and very tiny. Once you're done the main sites (within a few hours) there there's nothing much to do because it's so hot. I'd see if I could skip over to Lagos, Portugal. I had some fun times there a couple years back (nice beach town).
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