You'll probably want to do some more digging on these tenants before accepting them.6 adults and 4 kids in a 4/2 home is a red flag itself.

If there are issues with these items are these major red flags?

Although I've been investing in and improving multifamily properties since 2000, I decided to go back to school and get a Bachelor's Degree in Construction Management from BCIT (I already have my Red Seal in Carpentry).

Can I put a flag on his credit report?

And thats a red flag. 

What are the red flags and concerns?

With a warranty, there is red tape and delay in getting a repair made.With a vacation rental, your first priority is an immediate repair, to preserve guest satisfaction and the rental. 

It will help align your life goals and strengthen what you already have or expose any flags that might cause trouble if someone wants to divest...

I love it for the guaranteed rent, tenant stability, additional accountability with the housing authority and large demand for Section 8 housing without enough supply.With strong screening, I'm able to find great tenants and Im not owed any rent.Cons you will often hear is that the tenants are harder on your properties (doesnt have to be the case in my experience if you screen really well), the Housing Authority is a pain to deal with (this depends on a couple things - how well run your local PHA is and how good you are at handling process & details) and the extra inspections/red tape make the niche unprofitable (see what I said above about Housing Authorities).Done right, I believe Section 8 is one of the most stable & profitable. 

I would like to hear feedback/input from experts regarding any potential red flags.Could you share your insights on both short-term and long-term rental investments in Columbus?