Thinking about going to Benicàssim this year for the first time and would like some advice from people who have been before!

Where is the best place to book flights in your opinion/valencia is the place to fly to right?
Have any of you stayed in a hotel while at the festival? Read a few places that you can do this but not sure how expensive it is/if its worth it? If you have stayed in a hotel, where is the best place to stay?

Thank you in advance.