Centro Storico is the old town of Palermo, the main city in Sicily. It is an area, which includes some old neighborhoods. Here, you can see the most important buildings of the town like some churches or the cathedral. In fact, it has two faces: it is very nice, interesting, full of people, you can see some street markets, discover some very nice narrow streets or gardens. In fact, you can walk all day here discovering places.
On the other hand, these neighborhoods are degraded, you can see a lot of rubbish on the floor, a lot of strange people. In fact, it is not a very good place to walk at night, for example.
Summarizing, the place where you can see the authentic life in Sicily: the best one and the worst one. Very interesting.