I won't go to workplaces (or anywhere else 'public' or that may have other people wandering past/in) or anywhere I can't check properly with normal security procedures. I also have a minimum booking duration based on distance, for example I won't go outside my own town for less than two hours and since I don't drive, the place really has to have some transport links (I should point out that I do very few outcalls, but more because I can't be arsed).
I dont see what council estates have to do with anything? I grew up on one, and there were people there who had/didnt have money, and who were/weren't arseholes just like there is anywhere else - I certainly wouldn't turn a punter down out of sheer snobbery, if that's what you mean. If they follow the rest of my booking procedures, including being polite and respectful, why would I?