OK what follows next was her/his message to me.I need to close on or before XXXXth in order to avoid foreclosure for the owed taxes.I can converse by email tonight, but will not be available by phone until 10:00 tomorrow morning.BTW, thank you for such a fast reply!

Then again, once I found out the new Infiniti parked at the house was hers (and not the young gentleman's who lives there) any sympathy I had was clear gone.

Adding in-unit washer/dryers would be very desirable.Those are just a few ideas off the top.

What was her reasoning for needing to move into this person's house?

Replace with a used unit that has a minimum 1 year warranty from a place that has the repair folk in house.On your next turnover - sell the washer and dryer on craigslist.

They then started receiving notice of (IMO) unusual feedback - that the security deposit would not be refunded in full because there was dust on top of the washer - stuff that just doesn't sound legit.  

I’m planning on buying a house (under contract now) doing the major repairs and renting it out to a coworker who will be accepting the house in livable condition but who wants to paint interior (which it needs desperately) and paint cabinets From the 80’s (I’m planning on them replacing in the near future anyway) and is willing to allow me do some upgrades like redoing bathrooms and relocating the washer and dryer hookups while she lives there one project at a time.

One of them is that the plumbing for the in unit washers may not be vented properly.

Two bedrooms and one bathroom plus stackable washer and dryer.  

Although inconvenient, If you limit who has access, then you may potentially limit liability by keeping only the key holders accountable for the room and equipment, as well as could help protect your investment in washer, dryer, furnace, ect from intruders (guests, random people) who are not on the lease.