If they are marketing and bringing you new properties, then a percentage or a flat finder fee for each property may be appropriate.If their role is purely administrative and they are simply managing the rentals once they are received, then I would only consider a periodic bonus based on the increased workload.

SUPER attractive for marketing.

Over the Last 2 years I have become increasingly interested in the opportunities that real estate can provide for me to get out of the corporate rat race and doing something more freeing. 

I think they were trying to attract creative tenants. 

Putting a face to the name will instantly increase your credibility to them.

In the meantime you will have created great cash flow that increases your monthly income!

The attractively low price, oversized lot, and tons of concrete improvements made this acquisition a no brainer.

Unit A- Originally rented at $825-> Increased to $900.Unit B-Originally rented at $750-> Increased to $1,000. 

If you feel the need, just increase total deposit and note on your screening standards that smokers must have higher security deposit.

But if it's been 'recently renovated' I assume the juice has been squeezed out of any upside.Bottom line, it depends on the buyer you want to attract.