After all this time, you have learned to be ignored, no matter the place you go. As long as you don't steal anything or speak to anyone, your presence is as good as your absence.
No matter where you eat or what you eat, you don't feel disgusted when you ingest anything. However, you cannot appreciate a finer taste either. You can piece together enough for 2 rations when searching through garbage or other refuse.
You know the secret patterns and flow to cities and can find passages through the urban sprawl that others would miss. When you are not in combat, you (and companions you lead) can travel between any two locations in the city twice as fast as your speed would normally allow.