First house, we are living in it while flipping.

So the question is whether your house is a good rental investment long term.

You've probably heard of big Landlords losing property, but only because they were flagrantly violating Fair Housing, running a slum, or otherwise violating the law in an egregious manner.

As of today, the house rents for $3,400 per month and my PITI is $2,500 per month.

Consider house hacking when rates and prices are a little more balanced with reality.

I saw once where a developer gave the buyer a pass on paying HOA fees till a house was built on a lot. 

If you are willing to do the work, the landlord can often be the first point of contact with housing assistance.

What is the average acquisition cost of the houses?

I'd also send it registered mail or deliver it to the house yourself. 

Check and reset them daily to remove the dead ones and reset the traps.Poison is easier and works well, but the mice die somewhere in the house and you may have an odor problem for a week or two.