According to the 18th annual study of foreign workers’ overseas lifestyle conducted by the consulting firm Mercer, German cities offer above average quality of living for Expats. In contrast to the common expectation to find major international capitals like Paris, London, Hong Kong or Dubai at the top, Western European cities dominate the ranking, with German cities taking three spots in the Top Ten. According to Mercer, Expats living in Munich, Dusseldorf and Frankfurt enjoy some of the highest quality of living worldwide.
Among others, standards of safety, health, schools and recreation offered by 440 cities around the wolrd were investigated in the course of the study.
Further details in this regard can be found here: https://www.imercer.com/content/mobility/quality-of-living-city-rankings.html#list