Hey Raquel, welcome aboard the Spain Board! Living in Madrid I can tell you that we have had a cool streak lately (the past week has been an absolute joy!

). There have been great breezes every day and the nights are soooo cooooool lately! If it keeps up, I don't think you will have to worry about the room not being air conditioned.
Just in case, here are a few Mediterranean living tips to stay cool

:
1) If your hostal room is exterior (looks onto the street rather than an interior patio), keep the shades/curtains drawn when you go out all day. This will keep the room from being heated up by the grueling Spain sun.
2) Take advantage of the mornings and afternoons when the sun is at it's weakest to do thing outdoors and spend midday in a cool tapas bar, a museum or other type of indoor cool entertainment.
3) Drink lots of water (a universal concept).
Have an amazing trip.
Saludos,
jer...
p.d. and now for my shameless plug: Need a cellphone for your stay in Spain check out my new rental service at
www.onspanishtime.com/web/cellphones.htm