Cash flow and rents will be more important.Potential rent: $1300-1400Repairs:Tricky to say, I need to get some better numbers and estimates from contractors, but there are very few in this town and are exorbitantly expensive, so we plan on some sweat equity, purchasing materials in the lower 48 and having a cargo container shipped up and repairing / updating at our leisure.Downstairs will need new carpet (about 400SF), other half of downstairs has Pergo, but we might re-do the whole floor as the Pergo is in the entryway, kitchen, and 1/2 bath, all high-wear and moist/damp places, and it's a few years old.Upstairs will need new carpet.

Yes, mold will die from desecration, but if it get moist it can became harmful.

Really they're a terrible idea and seem to be damp/moist most of the time. 

Not just in typical moist areas like bathrooms--but in the corners of closets, under sinks, under a staircase and around garden unit windows and some walls.                                         

have some "moist" areas of concrete on a basement floor.

They are not moist at all, nor do they smell.

The floor was still actually moist and I hadn't used any water in that bathroom yet.

Clean with ammonia and water and then seal it with white pigmented shellac.

You could add a pigment to change up the color a bit. here's a link I found: http://www.abeautifulmess.com/2014/01/concrete-countertop-diy.html

When I've seen this it has been because the walls weren't constructed well and there are drainage problems causing the moist soil to push inwards.