Whitaker says there is  an imbalance of power between tenants and their property managers or landlords. He compares it to the employer/employee relationship where  rules  ensure the latter are treated fairly. That's not the case with tenants who fear being made homeless if they ask for  general maintenance issues to be addressed.
Some of the worst cases where tenants do raise issues make it to the Tenancy Tribunal.
Agents
A common issue is landlords going overseas and failing to appoint an agent under section 16A of the Residential Tenancies Act. In one such case Sarah Davidson, trustee of the Leigh Davidson Family Trust, was ordered to pay $300 exemplary damages to a  tenant.
Sarah Davidson named her father "landlord" because she lived in Australia, but admitted  she was "managing everything".
Substandard properties
If the landlord won't agree for work to be done, there is little rental managers can do. In one case, Hamilton property management business Ray White arranged quotes for landlord Ricky Sharma after the tenants at a Nawton property told them of  drainage issues.
The tribunal heard that Sharma thought the quotes excessive and failed to remedy the problems.
"The tenant correctly claims that this is not a relevant consideration and that the landlord has an obligation under the Act to provide and maintain the premises in a reasonable state of repair," the  adjudicator  said. The tenant was awarded $900 compensation.
Bond
Failure to lodge bonds is another issue.
Landlords and property managers are required to deposit the tenant's bond with Tenancy Services so they cannot unilaterally deduct money at the end of a tenancy. The tribunal hears many cases where this hasn't happened.
Illegal dwellings
Tenants are becoming more   aware of landlords letting unconsented dwellings. The tribunal heard that Fiaavae and Sukhbir Singh found, by checking Auckland City Council records, that the converted garage they rented in Otara had not been approved as a "lawful residential premises", meaning it couldn't be let legally.
The adjudicator ordered Taylor Property Management  to refund the couple's $2000 rent.
Quiet enjoyment
Another  issue is a breach of "quiet enjoyment". Havelock North tenant Jennifer Free was awarded $1615 when her landlord  moved into a granny flat on the property she rented.
The flat was not consented as an independent dwelling.  Free also  learned she was paying for her landlord's  power and water.
Smoke alarms
Working smoke alarms are required in rented properties by law and failing to provide them proved expensive for Mobile Property Management, which was ordered to pay Flatbush tenant Gareth James $2000.    The adjudicator  commented: "The effect on Mr James is obviously that his and his family's safety was put at risk."
Insulation
Since July 2016 landlords have been required to provide insulation statements to tenants. When landlord Feng (Irene) Mei Lao failed to provide the statement, she was ordered to 
pay $200 exemplary damages to her Mt Albert tenant Mohamed Shiyam.
Lao was  ordered to pay another $6,020.44 for other breaches of the Act. Photos showed the property to be damp and mouldy. Shiyam's infant son was admitted to hospital twice with pneumonia during the tenancy.
The adjudicator questioned whether it was a legal flat and told the landlord to seek clarification from the council before it was let again. Insulation becomes  compulsory in all rental homes from  July 1 next year.
Notice periods
Another  issue for tenants is that landlords can give  42 days' notice if they (or a family member) intend to use the premises as their "principal place of residence".  Jim Brown Rentals  wrongly used this rule against tenants Thomas Parkes and Robert Tod.
The tenancy  adjudicator  pointed out that in order to give 42 days' notice, the property manager can  use only one of the allowable exceptions set out in section 51 of the Residential Tenancies Act, such as the landlord moving in. Simply being "needed" isn't enough.