I was a de facto landlord/building manager for around eight years. It was actually my boss' job but he didn't want it. Neither did l but guess who won? It was an eighteen unit building. My office was just few yards from the building. I never advertised. Got the best referrals from the current tenants. No one is going to recommend someone they don't want to live near. It was trust on both sides.Sorry you are dealing with this. It sounds horrible. I hope you can resolve this problem quickly and effectively.
The units were older but the rents were reasonable and we renovated when we could.