If you are accident prone or have poor health, then yes, get insurance. If you are like me and most other people on the planet, pharmacies have everything you need and hospitals are world class and cheap.
Just search apartments on Booking.Com. There are hundreds. I usually stay at Dazzle Residence Sukhumvit Soi 7, but Citadines have several apartment blocks in the Suk area.
.......it is true. I spent 15 years out of the country. I had to do tax returns for previous years when I returned, not all of them but quite a few. One would have to give up Australian citizenship or die before losing tax residency. Even death may result in tax obligations being passed onto family.