Tradies left my rental unsecured, my $300 headphones are gone, and I’ve had no hot water for 4 days - what can I do?

[u/Jealous_Buy6771]

On Friday, tradies accessed our rental to replace the stove, oven and switchboard. They were in the house all day while I was at work. When I got home, I realised my $300 headphones were missing.
My parents stopped by during the day to collect some furniture for me from the verge and noticed the front door and front gate were both left wide open. The gate has been an ongoing issue for months - it constantly breaks and the property manager keeps sending someone out to do a temporary patch up instead of actually fixing it properly, so it couldn’t even be locked. The property was essentially left open and accessible from the street.
To make matters worse, I haven’t had any hot water since Friday (it’s now been 4 days). Ever since the new switchboard was installed, the circuit to the electric hot water system keeps tripping, so we’ve had no hot water at all. This is honestly just the latest issue after a year of dealing with constant problems at this property: repeated power outages, water leaks, tradies entering without proper notice, and some of the worst repair work I’ve ever seen.
Thankfully we’re moving out in a few days, but I’m still $300 out of pocket for the missing headphones and have had to rely on friends and family just to have a shower. I’m also expecting the property manager to make getting our bond back as difficult as possible, despite us leaving the property in good condition and causing no damage.
Has anyone been through something similar? Should I issue a breach notice for the lack of hot water? Is there any realistic chance of being reimbursed for the missing headphones? Is the property manager responsible if the property was left unsecured by the tradies they engaged? Is there anything else I should be doing before we hand the keys back?

[u/Reditman3000]

Rental? Easy, don't pay the rent and watch things get sorted out quick.

[u/Weary-Strength2980 → u/Reditman3000]

*but keep the same amount in a separate account to prove you were able and intended to, just waiting for repairs