What are your opinions as to this kind of arrangement.

If I can arrange to legally tow their vehicles you bet I will do it.

Does anyone know how exactly rent control currently impacts the above three arrangements?  

A percentage is always good, so long as its well managed, to ensure its an equitable arrangement for all.

Is there potential to use it for AirBnB or some other short term arrangement to increase the income?

Now, he reported the dishwasher is dead, and that still has the gas smell in the bathroom (from the missing P-trap), so he was going to make arrangements to solve the problem soon and deduct it off his rent. 

In a large minority of cases, the tenant pays both agents.There's no strict guideline and the commission arrangements are certainly not governed by law, except that any commissions paid by the tenant must be disclosed in writing and have the tenant's signature approving it.If you rent it yourself and have signed an "Exclusive Right To Rent" agreement with your agent, you will still owe the commission.As an aside, I try very hard to stay away from rentals.  

(Be clear: If it's a commercial arrangement with people you didn't know before, they're NOT "private money lenders"!)...

She has arranged inspections, repairs, found us great tenants, and helped us find valuable properties. 

I have a nice table cloth on it and a small decoration of flowers or some type of Knick knacks.