In reply to marky:
Hi Mark,
Me and Dan did it mid-October. We didn't start early, nor did we take enough water. After much faff taking photos on the headwall http://www.danarkle.com/climbing/#/view/ID1796404 we were both pretty parched.
With some better tactics (early start, more than 300ml water between you), you'd probably be fine.
We bivvied in a layby down by the main road - can't comment on the refugio.
An 80m single allowed us to run some pitches together, and you could bail from up high if needs be (lower your partner, clipping in, then get lowered off, (sport style) to strip it, thus staying in contact with the rock).
Alberto Rabadá o Murciana (6c) and El Zulú Demente (7a+) were both great too - the latter easier then Fiesta except for the very last 3m.