One thing I found to be important when vetting PM's is to ensure they use a sophisticated PM software and they give you access to it.

What Property Management Software do you use?

We need to chat, I actually have some questions regarding coding, software development, etc. if you would be willing to answer!

The two actions that were most instrumental in our growth were:1) Selecting full featured property management software with our first purchase so that we could focus on our processes.2) Developing a working relationship with a local portfolio lender that specialized in regional multi-family so that we could avoid issues with DTI.

Another thing you can do is require tenants to use your PM software service to report non-emergency maintenance issues.

Full disclosure: I work in real estate tech and am trying to improve on existing lead qualification software.

Using software like Quickbooks Online, Xero, Stessa (which is free), or a professional bookkeeper who provides these applications for you, you'll be able to pull much more value out of your financial data. 

We also had a chance to test out new programable overlocks and a new tenant software platform.

Another option is to use property management software that has built-in rental accounting features. 

There are several hosted software options available to you.