What was the one thing that really made you successful that you could duplicate regularly?

I would not pay attention to that data.1) The owner is probably getting called regularly, and being asked if they want to sell. 

Back then many PM companies worked out a "family" type deal; the janitor got the basement apartment rent free but always had to be on call and the wife was expected to do her share by cleaning the hallways on a weekly basis (this was fine with mom; she LOVED to clean). 

It is up to you, but I would at least charge her for the time it was vacant and any costs you had as a result of listings and cleaning.

Move in-out (including cleaning fee)Did I forget anything?

Pick something fun and interesting that will attract people to your meetup on a regular basis.* Initially, you will have some meetups where either only a few people show up or none at all.

Generally speaking if the credit report is clean, the tenant will pay their bills, including damages.

The best decision I ever made was outsourcing the @Miranda M Vinson  I dreaded the constant communications and cleanings and people with stupid requests and reasonings. 

It use to take me and a guy 3 days to do 1 clean up .

I'm trying to understand if we will need a property manager, or instead, just a handy man service, and a cleaning service, and we'll manage the property ourselves.