Hi!
The students rooms are renting for months, i think that the best options is a hostal/pension or a perhaps in the young hostel.(C/ Isaac Peral 2,tlf: 955 056 500)
About hostal and persión you can find it near from Canalejas street, in barrio del Museo. Is close center town and there is a lot of them. Also can find something in Barrio Santa Cruz but is also more expansive.
To see in Seville there is a lot of places, but recommend Salvador Church that was opened recently after its restoration, and places like plaza de España,Parque de Maria Luisa, Alcazar, Cathedral(the most largest gothic Cathedral in the world). And at night a good place is "La Carboneria" where you can enjoy live performances(Flamenco, Theatre, folk music...) in a traditional old coal shop
Also in many places of Seville can be seen in movies like Laurence of Arabia,Star wars: Episode II. Attack of the clones, 1492: Conquest of Paradise, Kingdom of Heaven, Blood and sand, and many more!
Buen camino!