Geographically, not politically, there are many cities on earth, many in safe area, others in dangerous. But most cities deemed safe typically still have some threats.
The main dangers include earthquakes, floods, bad ground for building, tornados, hurricanes, volcano threats, rising sea levels etc.
A good city location would typically be easily accessible, flat, have good ground to build on, near water (but not too close too the sea), have a good climate, mineral wealth etc.
If I had to choose a place, it would probably be Atyrau, Kazakhstan. It's close to the Caspian Sea, just outside an earthquake prone region, warm climate, semi-arid*, located along a river, mineral wealth (oil, but in my case, I would not use it as a power source, I'd make vaseline and oil for hinges instead) and it's located in central Eurasia and thus good access to the rest of the continents.
But I know many cities are pretty safe, such as New York, Dubai, most cities in the UK and Scandinavia, but they are still not really safe. There probably isn't a perfect place, but what would be the closest?
*Semi-arid is good because if a city is built there with a large amount of trees, it attracts rain and becomes slightly wetter. This has happened in places like Las Vegas and Dubai.
