There's a door to the rooms in the Harper hold on the South end of the southernmost room. It's kind of hard to see...
Can't help with the Copper Coronet thing other than to say that you must have whacked a patron instead of a Slaver guard or something. Did you fail at a pickpocket in there? Did you try to steal something from Bernard (Innkeeper) and fail? That will make everyone hostile as well. The only other thing that I can think of is that if your Rep. is *really* bad (like 3), then everyone hates you.
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Now where did I leave that doughnut?!