Category - City to live in between the ages of 25 and 35
Pick - Barcelona
Barcelona has got everything you could possibly want when you're young. As far as big cities go it's relatively affordable. Spain is part of the Euro zone and seems to be great at taking more subsidies from the EU than the tariffs it pays.
It's got the weather and the beach
It's got the food
It's got the nightlife
Pretty much every band that does a European tour has Barcelona on the list
It's got high level sport
It's got art and culture:
Gaudi has a lot of his work outside of Park Guell too. This is just an apartment block on the street
It's got huge green areas and parks if you want to chill out and not feel like you're in the middle of a big city. Just take the afternoon off and have a picnic and take a book.
It's got chill street life too if you're tired at the high pace of life
Oh and it's also got siestas built into daily part of life to help you burn the candle at both ends.