(Unless there's another way I dont know about.I would love any advise or criticism about this deal.

This could be a function of the paneling and firring strips pulling moisture out of floor, or could just be a damp basement.  

Personally I am waiting for a critical point that will likely tell us a lot about COVIDs impact on real estate.

As the majority of Americans have their net worth tied up in qualified retirement plans or equity in their primary residences it is prudent to evaluate the merits of each asset.One point to add I think is critical is that with a 401k or other qualified plans you have NO CONTROL over the asset and are subject to the government parameters set forth.  

See if at the end of each day he can at least leave part of the stairway functional in case of an emergency where the tenant needs to get down the stairs.

Some probably more critical then others.

The units have separate electric meters, unit numbers at the post office and generally function and appear as two separate units. 

In general you want to set up your critical path activities, which are the things that depend on each other to proceed and that is the most important timetable to pursue.

Since the house was purchased a few months ago are comps still functional in this situation?

Pricelabs to me is basically the same as doing it yourself but with way more functionality and options.