As far as validating the rental revenue, there are a few things to consider: ideally the estoppels would be notarized; confirm the lease agreement information matches the rent roll, p&l, and bank statements (bank statement would show you how much they are actually collecting); request copies of the executed lease amendments or other written or side agreements the owner may have had with the tenant(s). 

Should I get another appraisal and request a different appraiser?

My main concern is finding someone (other then the cleaner) that can help out with guest request and running things to the house if needed.

@Alan Faitel even if it does go on your bill, you can always request money from the guest after their stay and attach your bill as proof.

I’ve sent you a connect request, hope to learn more.

If everything checks out and there is only ONE thing that doesn't meet all requirements, I would normally request additional deposit, a Guarantor, or (in your case) reach out to the previous landlord before the treatment center.

Typically we request to review their financials and make a decision regarding their creditworthiness ourselves.

If this was not a safety issue but something the tenant requested be done then you could charge them.  

@Antonio Daniels 1-there are no different standards for screening...what you will find is that they will likely not meet your earning requirements (like 3x rent)...so you have to make exceptions...they also have very colorful backgrounds for the most part...after screening hundreds of section 8 tenants, definite patterns will appear...if you have a credit score requirement, odds are they will not meet there either (but there are fantastic voucher tenants out there as well...I've rented to nurses and other professionals with a voucher do to having a disabled child that needs a lot of services)...the one thing to be aware of is not treating them differently because they have voucher...2-The inspection depends on local authority, but the standards are the same...this is a federal program...so Housing Quality Standards (HQS) is the guiding document...how an inspector interprets that is another story...https://www.hud.gov/sites/dfil...3-Usually you will only have recertification annually, or possibly at an income change or a request or complaint...4-100%, it's one of the best sources of long-term steady income out there...I'll take a section 8 tenant over a white collar A-class tenant any day...plus you are helping to house the most vulnerable and underserved population out there.The bad things you hear about section 8 are from folks that do not understand the system and how it works, or want to be slumlords and not take care of their properties...or are ill prepared to deal with people in general.

During the last 10 months, we just had 1 repair request for an appliance, for which I used my home warranty.