-Enzyme solutions are available at pet stores and do a great job of eliminating odors because it's basically good bacteria eating bad bacteria.  

The enzyme odor remover combined with the use of an ozone generator seems to be working.

Long process of scrubbing every surface multiple times with an enzyme cleaner and priming every square inch with Kilz.What was the outcome?

All of the enzyme products I've found are specific to either dog or cat, I can't find a single one for humans. 

The bathroom floor and part of the subfloor in the hall and kitchen would have to come-up; the wall between the bathroom and hallway and across the end of the hall would be going back to the studs; the common wall between this apartment and the adjacent unit would need to be brought up to current {fire} code; the ductwork for the HRV needed to be replaced; and three of the existing windows had broken thermo panes.We also planned to improve the energy efficiency of much of the envelope during this renovation - the amount would depend upon what we found behind the drywall.What we found:The damage to the subfloor on both levels was more extensive than forecasted and I wasted two weeks, and a few hundred dollars in materials, over the holidays in December trying to remove the smell of pet urine (ozone, enzymes, sealant, etc).  

If you have not covered up the subfloor yet, stop in to your local pet store and look for "Natures Miracle" it is an enzyme to eliminate the urine.  

People think because it kills something that's alive, it must be bad for all life, but glyphosate specifically targets an enzyme that only plants have.  

(She lived there when I bought it).We did several cleanings with an enzyme cleaner (Nature's Miracle) which helped but did not entirely eliminate the odor.

Have you looked at using an enzyme based cleaner?

I used an enzyme cleaner down there called Mister Icky Poo