Hi Carmen,
Here's a few specific recommendations for your Spain travels in Seville book something city center is very small for hotels check out hostal Picasso, Hostal Goya, or Hostal Dali.
I've heard good things about the Green Prado Hotel in madrid, also the 3-star Hotel Victoria 4 is a decent hotel. I don't have any immediate hotel recommednations for Cordoba but you may wan t to consider a
Hostel in Spain. You could get a private room or shared depending on your budget.
Write back if you need more information on Spain.
Cheers,
Dan