I agree with both Desert Dweller and Booklady. There are so many variables involved. As Booklady asks, is really everything included? Even so, what if you decide, for example, to take a weekend away in Salamanca? Transportion, hotel and eating could take up at least 150-200 euros.

My gut reaction is that a budget of 660 euros for 5 weeks is cutting it a little close, but I may be wrong. Spain in many ways is not the bargain it was before the peseta switched to the euro.

In any event, I always advise friends to take along a credit card or ATM card if possible. You just never know and if there's one thing Spain has a lot of it's ATM machines. You can bring the 660 euros and see how far they get you. If it's enough, then no problem, but at least you'll have the comfort of knowing you can take out more (or charge) if you realize you have underbudgeted, or if something unexpected comes up, or if you simply want to go for that shopping "capricho".