Thoroughly enjoyed Valencia when I went over there with a mate of mine to see the Los Che vs Villareal or otherwise know as the Yellow Submarine.
Impressed with the Mestalla stadium which had a good balance of a new (due to a renovation) but still the feeling of an old school ground, plus very much in the city centre. The higher seats really do have a vertical/wall feel to them which creates a good and intimidating atmosphere but wouldn't advise if conscious of heights! Can't beat the views of the city from those seats as well especially during sunset.
Very different match day experience compared to back home where at half time almost in unison a majority of the locals get their home/shop bought sandwiches to consume rather heading to the bar. They also seem to love their shelled peanuts. Shells every where.
The city itself is others described beautiful with the benefit of a beach - although we needed to take a metro or bus to get there from the city centre. It has everything for everyone there ranging from fancy to reasonably priced restaurants to beach music clubs who want to dance off the paella.