Lol. My thought is how would people know weather it is incall or not. Mt first thought might be friend/dealer. Just because before it became legalized and sqdc poped up, going to see your dealer and smoking a joint with them was a common practise lol...
Sure agencies that have people walking in and out every hour on the hour would be a tell, but most indies aren't running a revolving door.
No one knows or cares who you are there to see in a place with many apartments. They couldn't tell, or guess, or care that it is the hottie on the 6th floor your going to see. You could just as well be there to see your sister/brother/parents/friend on any other floor. No one is walking in the place going, "So which apartment is the resident escort located in?" Most will only know or assume there is a very attractive person who lives in that appartment. No one will be keeping tabs on who is seeing them unless a neighbor is actually being a stalker. People all have their own lives to lead, rather than pay attention to going ons of apartment #xyz.