If there is an incentive for the management company to place undesirable tenants via lease renewal fees, then you should interview another.

I would focus on area first them find a good reputable company or companies interview them go out to visit them and the area and choose from there.

You'll have to feel them out.Call up at least 2 or 3 in your area and schedule a sit down meeting/interview and ask them every question from this blog post that's relevant to your property: 80 Smart Questions to Ask BEFORE Hiring Your Next Property Management CompanyThat's exactly what we did and it helped us have confidence we were choosing the right company.

Compile a list of people you want to interview.

@Brandon Benifield,Before buying my first property I interviewed my property manager, and I discussed issues like this.

I have questions, but i think interviews are a smiley world and not the reality.

I had a job interview 3 months ago. 

When you interview an agent, make that agent overcome your objections and prove their methodology.

Interview lenders, agents, accountants, and anyone else you need to work with.

@Kyle Allen, I highly recommend interviewing an account / CPA or two to discuss tax differences between the two.