This is a trap many new landlord fall into.

I just got new tenants in: week one we dispatched handy man because tenant complained of leak, fixed p trap in bathroom and while there we decided to clear dryer vent $155.00Week 2 Tenant says hot air out of A/C dispatching A/C man...

They should still be able to trap and bait the ones that are getting under the house.  

I don't want you to feel trapped in a lease that you are unhappy with.I'm enclosing an informational brochure about mold that was published by the City of Greenville, that you may find helpful, as well.Sincerely,YouI found a mold brochure put out by the City of Greenville online here:http://www.ci.greenville.tx.us/DocumentCenter/Home...I found a paper written by a TX lawyer on how landlords should handle mold complaints by tenants here:http://docplayer.net/2317612-Hot-topic-1-the-landl...He says you should contact your insurance company first.  

Are there any sorts of well known traps I should protect against (myself or him)?

You could invest in section 8 or other government assistance programs that help lower income renters.

Do not fall into the trap that just because the home is priced low a lot more people are going to be able to afford it.

As an investor, I've seen far too many people allow their emotions get the best of them and fall into that trap.

And as far as deflation, the federal government can't let that happen very much for the simple fact that they have put us in a bond liquidity trap and they would default on the dollar.When I see low skill jobs like fast food have doubled in wage over the last 8 or so years and are now paying $15/hour, then it seems completely normal to me that food should be double, cars should be double, clothing should be double, rent should be double, and home prices should be double.

To me it sounds like a trap.