If they are being properly run they are making enough to pay you over market rent.

Without proper permits, there’s a chance the city may request you to revert any non-compliant additions (like the extra bathroom) to align with code standards.When it comes to refinancing, banks tend to look closely at the property’s legal compliance.

The site also allows tenants to pay with ACH for free or for a fee, the tenant can pay with a credit card. 

Then another thing I see coming down the pike is the credit card debt.

Are they good with tenant and vendor followup to ensure job has been done and properly?

@Tyler Condon, it isn't proper but people do make side deals where the parties exchange money separate of the closing but at the closing table.

The other thing I often see is that over time, different homeowners/contractors have decided to DYI adjustments to their home aka took out walls, didn't shore things up properly, put in new doors, etc.My point is that what you are seeing is not abnormal for older homes. 

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

One day I went into my business and spent four hours dealing with a customer's debit card.

., smoke detectors, proper handrails).