1) Yiu REALLY need to know what CA will  allow you to do, I don’t know, but the state may say too bad landlord, you lose. 2) Assuming your attorney (Or you if you’re able to decode the laws that relate to your situation and are willing to go to court in front of a judge against a “sick” kid.) think you have the right to collect the rent I’d give them two options. 

Quote from @John Paul Palace: So has anyone out there gone the route of Rent to Retirement?

One just need some interior paint and refinish the hardwood floors and it was ready to rent.

Learn the trade at your door step and max.

You should require the new person to apply, pass your screening, and sign the lease.

My management company has recommended sending in their own contractor to make repairs as the tenant has concerns about mold growth. 

Better to make that mistake, and buy another deal, than to not bought the deal.  

Keep in mind that many responsible agents tend to be conservative with their valuations, especially in today’s market, where properties aren’t moving as quickly as they once did.If we’re in a conservative market, pricing on the lower end may make sense, but it’s always good to weigh your options carefully.

One problem may not be feasible to fix, and the other is easy to fix.Does the apartment complex have a unique feature that makes it more desirable? 

And it could take even longer than 6-12 months to find a replacement depending on the area.The other things to look at carefully are major Capex or maintenance expenses - you didn't mention whether this was a NNN lease.