An investor focused agent should also be able to help you determine what the future performance of a property looks like by producing you a nice proforma with budgets and projections.  

It'll be a bit riskier than buying something already renovated, but if you have the right team and numbers in place you could pick up some more equity on day 1, have less money out of pocket, and have something that produces some cash flow. 

I sometimes use Loopnet.com for quick examples of multifamily properties in different cities and the cap rate they produce, including the calculation itself.  

You'll need to produce evidence that the unit was left in a condition that didn't require cleaning.

There could be better options where you can still keep your monthly a bit lower with a higher income producing separate unit.Hope this helps!

I'm only building rental cabins which is a higher price point due to their ability to produce income. 

Vacation rentals in these mass-produced STR "neighborhoods" are really just a commodity, similar to a hotel room.

As far as a reasonable fee, I'd say it has to do with the value brought, and product level produced.

Once you pick one give it a serious dedicated effort, but if it's producing no fruit after several months you can always pivot and shift. 

A marginal producer isn't likely to improve if you increase it's cost of finance.This is where you would sell and 1031.