Really solid data and they have insane accuracy rates. 

Additionally, a mortgage broker I worked with previously suggested that before applying for a mortgage that I try to not have any other outstanding loans since the loan to debt ratio would hurt my chances of being approved for a larger amount, is there any accuracy to this?

If you do value your time and/or value the accuracy of the result - then hire a pro.Here is one blog post to start with: https://www.biggerpockets.com/...Planning is a good idea if you have something to plan for.

@Galaxy GavinI believer DealMachine has a feature for this and does ballpoint pen letters as well but I’m not sure the cost and the accuracy you can pinpoint to

app the best in terms of accuracy and ease of use, but they do have a small monthly subscription fee.

As such they are not as focused necessarily on accuracy of data in particular when it comes to being up to date.

I can't speak to the accuracy of AirDNA's data, although I think it has gotten quite a bit better over the past few years. 

I didn't read the articles attached to the links so I can't vouch for their accuracy.

It's difficult to know it's accuracy but it is data so that's a start! 

This accuracy and ability to keep simple and accurate records is because I develop my own software applications with MS Access and I develop accounting systems that are foolproof, idiot-proof and my recordkeeping systems and software has checks and balances that totally eliminate mistakes.You can do the same for 3 units with paper and Excel.