Here's what I wrote about it when I left:

https://josephg.com/blog/goodbye-sf/

Sydney and Melbourne have had massive increases in homelessness since you wrote this unfortunately.

How have you found London? And where would you recommend a Perthian turned Melbourian dev head to if we have to go overseas to find ourselves?

Homelessness in Sydney/Melbourne is extremely tame compared to SF. Especially areas like The Mission. I was floored on a recent visit at how bad the problem was.