While no one could guess at this point, it does seem like your roommate would be more understanding of any oddities/idiosyncrasies/problems that AS could present in social interactions if he has traits resembling those on the spectrum like the ones you mentioned (focusing on a specific topic, etc.) although it may happen to just be a combination of other factors, and not autistic-like traits per se.
In any event, I wish the best for the success of your new living arrangements.
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"There are things you need not know of, though you live and die in vain,
There are souls more sick of pleasure than you are sick of pain"
--G. K. Chesterton, The Aristocrat