Of course I figured it was at least an inn - though I was also thinking something more nefarious like a brothel. It's the phrase "I belong to the sign of the Bonny Blue Bell" that bothers me. I don't think of servants as "belonging" - except in relation to indentured servitude - which would be an American phenomenon and 1850 (the date it was printed) would be too late for that as well. However, "belonging" could have been a common phrase for working some where, so I could be making more of it than I should.
I am looking for more specifics as well - anyone suggestions as to where it is located?