Criminal background issues are common. 

What he did is in violation of his obligations to his client and may even be criminal. 

Any criminal background? 

However calling another agents client is like a prosecutor showing up at the jail cell of a "suspected" criminal and ignoring their right to counsel while "pushing their offer" after a defendant has stated a "desire of counsel to be present during negotiations". 

Ideally you'll want an option that  allows you to get a deeper look into their credit profile (credit history, breakdown of their credit score, accompanying remarks) as well as other parts of that report pull (ie. nationwide criminal background check, eviction history check, sex offender registry check, etc).

I’m a little confused as to which neighbor is which, but it seems to me that if there is verified criminal activity (I.e. stalking is verified in a police report) that it’s the offending party that needs to go, not the one who is being harassed.

Your landlord cannot retaliate againstyou for asking about or exercising your rights, including contacting the HealthDepartment or calling the Tenant Information Hotline.Your landlord is required to ensure that you review and sign this Notice, to provide you arenewed Notice if and when you renew your lease, and to keep your signed Notice on filefor as long as you remain a tenant.orientation, gender identity, religion, national origin, age, color, disability, ancestry,race, sex, sexualfamilial status, veteran status, or an expunged criminal conviction.IMPORTANT – READ CAREFULLY BEFORE SIGNINGAcknowledgmentBy signing below, I acknowledge that my landlord has provided me with theabove Notice, that I have reviewed the Notice, and that my landlord has given me a copyof the Notice to keep for my records.I understand that this Notice is intended as a brief overview of my rights andresponsibilities as a tenant and that if I want to obtain more detailed advice concerningmy legal rights and responsibilities, I should consult with an attorney or other expert onhousing issues.Please do NOT sign below unless your landlord has provided you a copy of the Notice tokeep for your records.Tenant Name: ________________________________________________Tenant Signature: ____________________________________________Date: _________________________________________Try googling some of the words in here so you can get the official form and have the phone numbers.

If that’s the case, it doesn’t appear you even take criminal records into consideration in your criteria.

They are the overwhelming choice of criminals for fraudulent payments.

If everything is good except the credit score (maybe get a copy of DL and do a criminal / civil judgment check on him and the co-signer also, since those don't show up on credit reports anymore), you might just go off employment, followed-up job and landlord references, co-signer, and very landlord-favorable lease and payment terms.