You have to find accommodation.
Decide which the best option is:
Price, facilities, dates etc.
These are some examples
HOTELS
YOUTH HOSTELS
http://www.hostels.com/valencia/
APARTMENTS
http://www.venere.com/serviced-apartments/alboraya/patacona-resort-apartments/
CAMPSITES
http://www.campingsonline.com/spain/valenciancommunity/