As you continue to interview PMs, you'll add/remove questions and you'll begin to understand the flow of asking questions to highlight your main priorities.

Finally I interview them to make sure they see their job as a combination of looking after my financial investments, and keeping the renters (aka customers) happy. 

See who you like and remember you are interviewing your potential teamMember for a long term relationship.

Rob- why not interview a few builders?

MadFi interviews a variety of people at different points of their journey. 

A recent podcast I listened interviewed Kris Krohn and he actually recommended not for varying reasons.

that's a lot of bread to get the leads.. so you need tons of seed capital.those that have little to no marketing money to start .. pretty tough unless you bag a deal right out of the gate to keep you going.its the same for real estate agents getting started in that industry.. when  I had my shops and interviewed new licensed agents it was something we talked about.. you need ONE years of living expenses in the bank to even think about starting in this business.. same with wholesaling.. to try to do it with no money while it can be done .. flame out is virtually assured because of lack of capital in your small business. 

I'm currently in a Real Estate Investing course (through my college) and need to interview an experienced real estate investor for one of my assignments.

Plus I interviewed painters and bathroom remodelers and workers to upgrade our current home in order to get top dollar for the house.  

I heard a interview with Warren Buffet the other day.