Our two STR's came with locks that require an extra monthly fee if we want to change them remotely. 

I also tack on a $50 pet cleaning fee because there will generally be some extra cleaning related to pets when they leave.

To us, it's worth the 8% of rents and the extra costs in repairs, and they still cash flow well even with the extra expense.

Build a contingency budget into your plan by allocating an extra 10-20% for these surprises.To get ahead of potential problems, conduct thorough inspections from top to bottom before buying a property.

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

For example, I have small two teir rolling cart in the movie room/game room that provide extra space for drinks, glasses and ice, etc.

Since then I've begun to use the rent collection portion as well, which removes yet another layer of complexity!

If you wanted to give them a few extra days at a premium rent, that's up to you; but they need to be out as you've rented the home. 

And short periods of time generally expose the investor to lots of extra risks including execution risk, refinance risk, interest rate risk, etc.

But, you’re dealing with commercial funding anyway, for a little extra work and a few hundred dollars, doesn’t it seem like a good investment?