It was just the two of us but when we rented our house we added the fence with a pool style gate latch. 

Add value to them and they'll teach you a lot that will translate for years to come. 

Trends, styles and amenities change, the most successful operators evolve with the hospitality marketplace. 

We teach this in our training.

This is the creative solution to still having your own private space without spending $$$ on a plex or existing ADU.4: By the Room: We call this boarding style.

As in, if I buy low in a complex and make renovations in line with other townhomes in the neighboring complex that are selling at a higher price like the example I used earlier, does that not matter because they’re in different complexes, and that has its own value in and of itself, even though they’re now the same in terms of style/updates, sqft, br/ba, etc?

You’re right cleaning it up for them will not teach them a lesson.

I have 3 beds 1.5 baths in a bungalow style home on a fairly tight dead-end road.

Tell him to teach his daughter to stay away from them.

This is all assuming some type of rowhome style of construction, which may not apply to you.Beyond that, I have had success with my single family rentals.