Silvita, if you absolutely can't find anything IN Sevilla city you might want to consider booking something in the nearby village of
Alcalá de Guadaira . We stayed here during my only time to Sevilla during Semana Santa several years ago and were able to take a daily bus from the village to the city. Seems to me it took about 25 minutes and was cheap. The only problem was the last bus back to Alcalá de Guadaira was at about 11pm. I think the one night we drove the car into Sevilla and parked in a parking garage because we were there allllll night long with the processions. You wouldn't have to take the bus if you didn't want - you could drive - but the traffic and road closures in Sevilla during Semana Santa can make things a bit difficult.
To find hotels in Alcalá de Guadaira you could do a Google.com search using the following search syntax:
"Alcalá de Guadaira" +hotelTo find the distance between the two, drive time, and routes, go to
http://www.viamichelin.com and plug in your city names.
And who knows, hotels in Alcalá de Guadaira might just be a bit cheaper. Alcalá is a cute, whitewashed village and they have their own processions too.
Best of luck! Saludos, MadridMan
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