Ah I was just passing through, was on a road trip with my dad. So no, I dont know it very well but I did like what I saw!
The plaza and basilica were great.
Modern art museum and terrace above pretty cool
Roman theatre was awesome.
Loads of Goya stuff and various museums. Some of the war scenes are straight out of Syria. Grim! My dad liked it.
Wine and menu del dia pretty good, tapas bars in the old town on a few streets around iirc calle liberadores well worth checking out.
Not too far from Barca, pamplona and the pyrenees which are WICKED. It is probably a scorcher in summer, but you could head to the coast.
The north of spain neednt eat your money, altho san sebastian and barca probably will. I like both but find san seb a little meh at times somehow. Great place, not denying that, but when youre young it's a bit too..... well bourgeois really. Bilbao is more interesting, more to do and more of an edge. Vitoria is also GREAT.