As soon as we parked our car in Matmata we were approached by a local who said hello and asked were we french - no, german - no, american - no, italian-no, english-no,etc.
He asked did we want to see a typical Berber home, then recommended Chez Abdoul for lunch and suggested after our meal we would like to see a typical Berber home. we were used to this after four days in tunisia so we ignored him but this sort of atention can get annoying and can be off putting for visitors not used to it.
Most guides books, if not all tell that you should only drink bottled water. This is certainly a wise advice and you have better follow this precautionary principle. However, I did not and when we camped across Tunisia, we always picked tap water where it was available, as here, near Matmata and had never any problem.
Often on the roads near the smaller town you will have to wait for the sheep or goats to cross. I suppose they have the right of way. The sheep herders are in no hurry they take their sweet time, but hey, who cares? What appointment do you have to keep?