Yes Moderation in all things. I recently met someone who could not set and appointment to skype because he was busy drinking nightly. He would never see it that way but it is true. He thinks that is normal but it is not normal for me. That is something he does not want to face is a serious problem and is going to ruin his chances to find anyone.
I think having one's own interests is good, but one has to be able to open one's life and schedule in order to even give a relationship/friendship a chance.
Also I agree with Lauren, a sense of humor is vital!
Drinking socially, and in moderation, would be not more than three beers or two mixed drinks per week.
I agree with you Marian, that I would want someone who is emotionally available to me. If one is often "sloshed" from drinking, that is not a spouse that I would care to have around.