The other problem with a punch code system, where strangers can be on the street and punch codes until someone answers, means that some stranger will be buzzing me. 

I am suspicious when someone wants me a stranger to support them when they can't  get a family member to do it.

My wife wants me home more and I will start working to sub out showings, experiment some with giving strangers lock box codes (nervous about that one) and continue to work on improving my list of needed repairs - and order to do them to speed things up and minimize my need to go to the property.I am nowhere close to considering hiring a property manager.  

I can't tell you how many times I went back and forth with a tenant about a good time for me to show, only to have the potential tenant no-show on the appointment, then all that time is wasted, the current tenant is annoyed, I'm annoyed, no one is happy.There are potential issues with allowing strangers to walk around an occupied property.

The house was a little messy and she would not have wanted strangers parading through the home.

I can easily print up "official" paperwork from the town proving I'm the owner.Bottom line is if I'm taking a property of mine that's worth north of 100k and giveing some stranger access to it then THEY WILL jump through whatever hoops I desire in order for me to protect that 100k. 

And you won't put your current tenants at risk, or increase your liability for anything that could happen because you forced them to endure unvetted strangers being allowed to parade through their home and their things.

Look at the comments from complete strangers.

If you sign a term lease you are essentially just tossing the dice on total strangers with no plans for escape if you are wrong.

It’s crazy we come to the internet to get verification from strangers we never met.