I spent some good liberty (from Navy duty) weekend hours at the Coffee and Confusion in San Francisco in late 1967. That was my first exposure to the coffee house concept. I later lived for several years within a couple of blocks of the No Exit in Chicago, and totalled up a lot of hours there.
Believe it or not, the metropolis of Lapeer, MI., now has a small decent spot, "Cup o' Joe's", with fairly regular Friday night music.
The music can range from good folk and blues to gawd-awful zero talent rockers, but at least somebody's trying to keep it alive.