I asked them if they planned on sleeping 2 guys per bed and have no kitchen, no wifi, no washer/dryer. 

Put it wall to wall throughout the entire unit, except maybe the bathroom.I used to manage an old apartment building that was bare bones - a good price in a good neighborhood, clean, well-maintained (great manager ha ha), but mostly really tiny studios, no washer/dryers even in the building at all, showers only, no disposal - you get the picture. 

I perform periodic inspections(2-3 per year), as well as performing basic maintenance(suck out dryer vents, change out leaky faucets, replace air filters), which gives me good insight as to how the property is being cared for.

We don't supply fridges, window ac, or washer/dryer.

For instance, what if you had a fee that said that people with brown hair had to pay an extra fee. 

I am doing a few changes including legalizing the basement suite and one place I'm struggling to find a good solution is on adding a washer+dryer on the main floor.

In terms of legitimate numbers, besides the construction cost above, remember that the majority of these homes are very old and adding rooms can be tedious, stressful, and might make you want to pull your hair out!

Also, be sure to have multiple car dash cams, and ring cameras in every room.Don't ever go in the same room alone, never close the front door or any door in the house, never look her in eye, for goodness sake never make any comments about her clothers, hair, appearance......depending on what specific things listed above, you think are a joke or good common sense, will determine your level of neuroticism about the topic and should probably let you know if you have right mind set for the leasing agent job...jus sayin

I know its splitting hairs and probably wont matter, so I'm just wondering.Thank youJohn

Currently the first floor is a hair salon and the second floor is a one bedroom apartment.