In reply to greycarsdave: This probably is not much help since I climbed it in summer ~12 yrs ago, haven't been in winter and my memory of routes I've climbed in notoriously bad.
No difficulty finding a bivi spot (Went from Marrakesh to about 3/4 of the way up the route in one day)
Would suggest the AD grade in my ancient guide was about right for summer.
Don't recall much loose rock on the route.