For example, management not treating tenants in an ethical way (not repairing air conditioning when they were supposed to, or not repairing plumbing or other major issues in a timely manner.)I've also heard some stories of success too, so I say be very cautious.

I need additional vents installed at the base of a brick house in the Heights (needs more air flow).

If there's obvious mold, then that should lead to investigation because there's likely a leak (or no air circulation).

Because they are so light and because of their shape they can float in the air for long periods of time.

Or worse...they aren't an investor at all...so they just pull numbers out of thin air!

The amount of air fare , hotel , rental car, was all a tax write off and well worth it. 

By the time I got to the house to observe the issue she had it all cleaned up but the funk was still in the air.

What types of routine or emergency maintenance will it need (water leaks / exterminator / smoke & CO2 detector maintenance / air filters / gutters / outside maintenance / paint / flooring / refresh between tenants, etc.).

This is a great little area ,it’s got a lot going for it as mentioned above plus they have started work on the $500 million judicial Centre ,a little east of here towards twin aire and if you’re feeling brave and have good risk tolerance and cash you could look at streets north and south of English near Twin Aire .Good potential there ,it will take time though 

Have you made any major improvements to the home like roof, replaced furnace, air conditioner, etc?