I'm coming to San Francisco from out of town, staying near Union Square (Powell and Bush), and seek cheap, casual, nonchain, nontouristy, and very good places for lunch and dinner within a short walk. I'm well aware of such places that exist beyond a short walk, so no need to suggest other neighborhoods, which I will get to anyway.
I'd be eating alone, casually dressed, in my 20s, looking lonely (kidding). This is only my second trip -- on my first trip I noticed a plethora of pricey, not casual places in the area where it didn't look like I'd be so welcomed.
Or should I just give up before I start, and head straight to other neighborhoods like the Mission? (which I will do anyway, and I know where to head, but this post is an attempt to cover the waterfront (though not literally)).
Thanks in advance!