When those methods become too time-consuming or difficult to maintain accuracy, then you should look for a software platform that solves your problem.

Prepare a CMA to understand rents and competitionA comparative market analysis (CMA) helps you to understand what the fair market rents really are, choices tenants have on where to rent (in other words, who your potential competition is), and what a reasonable price to pay for a property with good cash flow is.The accuracy of a CMA depends on how well the comparable properties are chosen.

No better accuracy than Spokeo and a number of other services, very hit and miss.

I was more so wondering how I should go about verifying the accuracy of the rent and maintenance of the property.

Does anyone care to share their thoughts on the BP rent estimator accuracy? 

The issue with these is the accuracy of the data.

Based on what you described, I am very curious about the rent estimate accuracy.  

Is there anything I can to best protect myself and ensure the accuracy of her claims.

Accuracy is not a problem since it's a simple filter and with enough sources I can mathematically account for the error rate. 

Only they can answer this question for you with accuracy.