I don't know about the least stressful part but hard to disagree with the most stressful: http://www.cnn.com/travel/article/least-stressful-cities-2017/index.html
Least stressful
1. Stuttgart, Germany
2. Luxembourg City, Luxembourg
3. Hanover, Germany
4. Bern, Switzerland
5. Munich, Germany
6. Bordeaux, France
7. Edinburgh, UK
8. Sydney, Australia
9. (tie) Graz, Austria and Hamburg, Germany
Most stressful
1. Baghdad, Iraq
2. Kabul, Afghanistan
3. Lagos, Nigeria
4. Dakar, Senegal
5. Cairo, Egypt
6. Tehran, Iran
7. Dhaka, Bangladesh
8. Karachi, Pakistan
9. New Delhi, India
10. Manila, Philippines
1. Stuttgart, Germany
2. Luxembourg City, Luxembourg
3. Hanover, Germany
4. Bern, Switzerland
5. Munich, Germany
6. Bordeaux, France
7. Edinburgh, UK
8. Sydney, Australia
9. (tie) Graz, Austria and Hamburg, Germany
Most stressful
1. Baghdad, Iraq
2. Kabul, Afghanistan
3. Lagos, Nigeria
4. Dakar, Senegal
5. Cairo, Egypt
6. Tehran, Iran
7. Dhaka, Bangladesh
8. Karachi, Pakistan
9. New Delhi, India
10. Manila, Philippines