From memory, damage to stove could be covered by landlord insurance but not maintenance or replacement due to old age. The original stove may have been OC responsibility, but not any subsequent stove.
When looking at strata insurance you need to get the PDS (Product Disclosure Statement ie policy papers) which often come with a summary of what is covered (eg building, catastrophe cover etc) and to what degree.
Decide what you want covered (some items are optional) and to what degree (i.e. how many $ of cover).
Then compare the above items across several insurers. I say “several” because there are many different insurance companies, but ultimately only a small number (3?) of giant organisations run the insurance market in Oz. The high price of insurance is very much a function of the absence of competition.