The question is: How far is it from being a desirable area for home owners ?

I have read that South San Angelo is a more desirable area than North.

We will also be replacing the front door to give it more weight.

Maybe it hold more weight in other markets but I find it hard to believe its anywhere near the extent that this guy makes it out to believe. 

If the neighborhood you are in is...less than desirable, than it will be difficult to sell.

Based on my experience, this type of problem is a common occurrence, frequently because of a desire to get a deal closed at any cost, but it can also turn into a big deal.  

I rehab older homes regularly I’m very familiar with your situation.Vinegar is very effective but the carpet has to be removed and floors mopped throughly.I always use oil based paint primer throughout the entire house then I repaint with my desired color.

If you only desire heating, a flush mount wall heater is much cheaper Than mini split but less efficient than the mini splits.  

This can make a difference not only with taxes and boro/magistrate fees but also resale/arv values because districts do hold a lot of weight when it comes to homeowners (and renters) making decisions on where to live).

Assuming it's not an A+ luxury unit in the most desirable part of town, then I'd usually recommend a plastic shower curtain instead of a glass door, because it costs much less and can be changed easily between tenants (whereas a glass door often accumulates water spots that can be difficult to fully clean after a few tenants...and, as you mentioned, if a tenant breaks a glass door, that could be a costly headache).Also, assuming it's not an A+ luxury unit, I'd usually recommend going with a fiberglass unit (either tub or shower) instead of tile, because tile is usually more expensive, and it can be more likely to begin leaking, and it requires more upkeep.