Turn the question around to ask them if they would feel guilty asking their boss for a raise if they were being paid less than a co-worker doing the same job.I think part of the problem is they think landlords are rich and make tonnes of money. 

You can also apply for a CO and they should provide you with a list of things you have to do in order to get one, which will probably mean closing all of the violations.

Applicant(s) has verifiable combined income of at least 2.5 times the rent amount.Applicant(s) has verifiable combined credit score average of at least 600Applicant(s) has verifiable combined income of at least 3 times the rent amount if credit score does not meet criteria but is at least 550 combined averageApplicant(s) has verifiable credit score of at least 700 if combined income does not meet income criteria but is at least 2 times the rent amountApplicant is able to provide a co-signer which meets verifiable criteria, if applicant is unable to meet the credit score or income requirements.Any input would be greatly appreciated. 

Not with a co-signor.    

They also fill out a co-signers addendum to the Lease that states that if Tenants do not pay, they will assume responsibility in paying the due amount!

Try to find a co-host and then gradually wean off...go more for VRBO and private bookings....

Oh yeah, I also asked about a Co- signer and the loan originator said I still needed the work history.

I understand the risk involved becoming a co borrower.

However, if given the choice of last months rent or a co-signer... co-signer is the better way to go... bet the co-signer the same way as you do an applicant and you’ll be solid.

Turnover will be higher (1-2 years on average for us) as kids like to move around and change housemates and they grow and learn more about themselves.Unlike John's advice above, I do not recommend having parents as a co-signatory  to the lease ...