We ended up putting that on the backburner and using the typical Airbnb, Furnished Finder, Zillow, etc. routes to fill our units.

I have made a lot of money in RE and negative cash flow is not a criteria that i typically ponder.  

That will typically spook them into catching up or chase them out.I recommend you read some books (see my signature?)

If you can find a good deal in Harker Heights, those properties typically rent the fastest. 

Typically they tend to cash flow well so a 4 unit might hit those 1% rule.I'd also highly recommend local real estate meetups, as you'll get local insights

No matter where you choose to invest, please keep in mind the following (copy & paste):--------------------------------------------------------------------------------------Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a Class A property in Class D area, what quality of tenant will you get?

Given appreciation is typically where you are making most of your return in any real estate, having this additional appreciation helps create much higher returns.Additionally, my single family tenants, typically stay a couple years longer than my duplex tenants.  

No, lenders typically don’t require that.

If you're planning to use an FHA loan or another owner-occupant loan, there are typically rules about tenant occupancy.

@Ash Gowda - typically a 1.3-1.35 dscr.  5/7/10 (all dependent upon the lease term and re-ups); Rates fluctuate but for now from low to high 6's fixed.