It's hard to say from my point of view. Where I live it is extremely hot so I am used to it and don't mind. However, I agree with the others. Most people will want air conditioning.
You can always open the window and buy one of those fold out fans that are so commonly seen in Spain! ;-)
P.S. Does anyone know why this is? Where I am from, we always called those "Chinese fans" but I was shocked to see just how common these folding fans were in Spain. Just curious...