I'm far from an expert, but I understand that darkness and temperature are the main considerations. There's a little blurb about it here: www.winerackshop.com/storage.htm   but I'm sure a little googlery would turn up more info. As far as I can see, it should be fine for a cellar as long as the temperature doesn't drop to around freezing (but I really wouldn't put too much reliance on my opinion on this!)