A lot of providers in the city don't have a fixed incall. Some do (and those providers tend to advertise it), but many do not. Last 5 I've seen here in the city did not. (Hell, one I saw in late December, who typically takes incalls in the city, didn't have her incall in the city at all!)
So even if I were to post that a provider was in Gold Coast in a review, that information would be useless because if you meet her, she might have her incall in Lakeview or Avondale. And then you'd come whining at me because *you* thought she's based in this neighborhood when in fact you saw her somewhere else. So I see no reason to give you that information because I don't want that headache from you.
Like...your initial argument I understand. At least getting the town down means something because you're right, you don't want to be hornswoggled in being told they're "Chicago" based but in fact have their incall in Oak Brook or (heaven forbid) Carol Stream. But the neighborhood? Please.
Most providers will send you the incall location the night before, which is more than enough time to plan your trip in. And even if they didn't, I'd always plan extra time in to account for the commute to the incall. If I, a carless resident of the city, can still make it to an incall in Schaumburg/Hoffman Estates on time with only a few hours notice, you can get to an incall anywhere in Chicago just fine.
Put back on your big boy pants and just plan accordingly. If you're that concerned about distance and commute, just assume it it is either downtown or the farthest point in the city from your suburban house, and work it out from there. Hell, ask the provider where the incall likely will be while you're scheduling if you're that concerned.