My classmate said that Paris in France is dirty, people stink all over, and houses are full of dust and so on. ...

Paris is quite big. Not all areas are prosperous, fashionable and romantic, but there are slums. It's just that what we see on TV is the glorious side of Paris. But most of them are clean and romantic. It is not a myth that he can become a world famous city, but he still has strength.