Phil - By quiet, I just mean when the actual performances are going on. I'm going to go on the hunt for a place like you described. But, I do think the warehouse open mic would be kind of cool. Espeically because some of us would know each other, and then this one knows that one, ect. I could get our local songwriters group to come out, possibly. But, like I said. I'm going to do some research - first by attending some other open mics. Maybe playing one or two. I honestly DO NOT want to bite off more than I can chew, and I can see how it could happen fast. So, while this is a goal of mine, it's not a 'gotta do it right this second' goal. 
Noisy audiences...a real bug bear of mine...... its not gonna change while it is FREE... cos there is no value attached.. Its a scrambled egg thing........ Kinda hard to put the egg back where it started.. Hmmmmm There is a song in that
john