Check their FB, check out their car, call all the references, ask about pets, etc. 3.

He chose the apartment partially based on their no pets policy. 2) They smoke pot on the porch (now legal in NV). 3) They participate in various other activities like drinking and vaping. 

Think through pet policy and how short term you are willing to do.  

Beyond that, built into the contracts are fees for pets.

Not to mention the great feeling accomplishment.BTW, my favorite smell is that of pet urine in a property for sale

We feed/watch each others pets, share an occasional meal, have gone to a few local events together, etc.

Water damage, mold, old systems, leaky roof, rot, odor (humans and pets), old windows, filthy, etc. 

While you didn't say anything that was illegally discriminatory, you also didn't say why them being sisters and having no kids was an issue.2) Pet policy - what is it?

Here are "a few".Application to RentAsbestos DisclosureBank Draft AuthorizationKey Forms for receiving and surrendering keysLate Charge NoticeLead DisclosureLease AgreementLease Violation lettersLease RenewalMove In FormMove-Out FormCredit Report FormsNo Pet/Pet AgreementNoise Warning NoticeNotice of Intention to Enter DwellingNotice of InspectionPest ControlProperty Abandonment FormsHow Security Deposit is HandledSmoke Detector Carbonmonoxide AgreementNotices to Pay Rent or VacateMaintenance Request FormsYou can reference your landlord tenant laws in Connecticut to make sure any forms you use are in compliance.http://www.jud.ct.gov/lawlib/law/landlord.htm

Interesting thread and I like every response that I've read.This speaks to the timidity of would-be, new investors who consider approaching off-market owners/principals directly.At the root of this is fear: Fear of undesirable consequences, legal, financial, etc.Have you ever petted a snake for the first time?