@Keith Shackleford
wifi smart locks - I would be careful of those, from a hacking perspective. Do you plan on self managing or having a property management?
external garage key pad - Great idea and allows guests to access just the garage or if they get locked out.
closets that can fit a twin bed, small nightstand, power, with air vents - I would do a bunk room as opposed to twin beds in the closet. Just like previous comments had said.
luggage storage in the garage - great idea
dedicated full bathrooms for each bedroom - Great idea as well, but not a necessity as long as you have a jack and jill.
semi glossy paint that cleans easier on stairs below chair rail - minor detail
dedicated cleaning closet - either that or space in garage. Does not necessarily have to be in main living space.
large capacity W/D - don't splurge here, especially for guests. I would say its probably more important for you or your management for cleaning purposes.
You don't want to be too specific, especially if you want to convert to long term rentals in the future or even selling them as independent units themselves.