What bad things happen in Paris?

* Terrorist attacks. Paris has been the site of several terrorist attacks in recent years, including the November 2015 attacks that killed 130 people and the January 2015 attacks that killed 17 people.

* Crime. Paris is a relatively safe city, but there is still some crime, including pickpocketing and theft.

* Traffic congestion. Paris is a congested city, and traffic can be slow-moving, especially during rush hour.

* Pollution. Paris has a pollution problem, and the air quality can be poor, especially in the city center.

* Homelessness. There is a significant homeless population in Paris, and it can be difficult to find affordable housing.