Today, I left Sevilla for Madrid (sigh). We stayed in a fabulous apartment minutes from the cathedral in El Arenal. Absolutely charming & less expensive than any of the hotels I could find. Look on www.sevilla5.com , if you are staying for 3 nights or more, you can get a great apartment for the same money. The one we stayed in were in the apartment section under ´personal style´and are on Arfe. (the street)
We had a fabulous time.
Hope that helps!