Sel, I've haven't been to Cuenca (yet!) but do have friends that have gone. I don't know how it will be in feb. except for cold! But as far as what to see, the city of hanging houses is really something!
Salamanca in Feb... well, I don't know about that. Its more students than anything (LOTS OF FUN!
) but they have exams during Feb. so I don't know how hopping the city is going to be then.