Each year 140 cities are given scores out of 100 on a range of factors such as living standards, crime, transport infrastructure, access to education and health care, as well as political and economic stability.
Vienna's ratings, particularly in the stability category, was enough to overtake Melbourne.
Vienna overtook Melbourne as the top-ranked city in the world for liveability, scoring a near ideal score of 99.1 per cent. The city was also ranked ahead of London in last year's survey. Melbourne, Australia, 3. Osaka, Japan, 4. But while Melbourne extended its lead in the culture and environment component, that was outweighed by Vienna's improved stability ranking.
Canada performed well as well, with Toronto tying with Tokyo for seventh position on a score of 97.2% and Calgary (97.5%) and Vancouver (97.3%) taking fourth and sixth place respectively.
"Although it was overtaken by Singapore in the rankings for the first time a year ago, Hong Kong has now surpassed its regional rival, albeit with only a marginal difference of 0.1% overall".
Ben Stokes rejoins England squad after being cleared of affray
Ali, an emergency services worker, suffered a fractured eye socket while Mr Hale, a former soldier, was left with concussion. Ali denied that Mr O'Connor and Mr Barry were being "a bit of a nuisance" and he and Mr Hale were getting "irate" with them.
Australian cities, including Sydney and Adelaide, still make up a big portion of the list's top 10.
The survey also looked at cities where long-term improvements had been made.
Who beat Melbourne? None other than the criminal city of Vienna, best known for opera and having honestly way too many museums.
In total, 68 cities have seen their liveability ranking improve over the past year, while it has declined in nine cities.
The 10 cities lowest in the ranking were Damascus, Syria; Dhaka, Bangladesh; Lagos, Nigeria; Karachi, Pakistan; Port Moresby, Papua New Guinea; Harare, Zimbabwe; Tripoli, Libya; Douala, Cameroon; Algiers, Algeria; and Dakar, Senegal.