How early should I start looking for a flat in Spain for my year abroad?

I'm currently applying for a British Council assistant placement in Spain for my third year abroad, and I'm hoping to get placed in the likes of Sevilla. I know that British Council can take as long as until September to tell you where you are placed and I'm worried about finding accommodation. I also want to do Camp America this summer but I'm scared I'll find out my placement in July and have no way of looking at accommodation until I'm back in Europe! Can anyone give me any advice/suggestions or tips on when to look for accommodation?