But I do see the argument for maintaining higher payments and accumulating principal faster.

I think if you did a "bang-up" job with managing the property for the current tenant and the tenant maintains a nice, clean place and is cooperative, you can pull off showing while occupied.

Unfortunately, at some point in the future they might decide to close down the pool because maintaining them cost a lot of money, not including cost to repair.

Most importantly, maintaining subcontractor relationships and developing and sticking to a critical path schedule.

I calculate the operating expense ratios at around 39% (the property very well maintained - but maybe this is too low). 

The notebook also includes information I've gathered over the years about how to maintain/repair appliances and an appliance maintenance log.

This is a well maintained house, central air, all hardwood floor, very spacious, partially finished basement.

I'm assuming not sense they maintain control of the loan. 

If we are able to establish and maintain a good landlord-tenant relationship by using open-honest-clear communication, by providing good value, by keeping our property well maintained, and by treating our tenants respectfully and fairly, we are likely to have better outcomes.

Investing in historical properties comes with its own pitfalls but so worth learning about as we can acquire these homes for fantastic prices, people love living in them and pay a premium to do so, and they are so worth fixing up and maintaining because they are beautiful. :)As far as your $3K you have saved I would like to give you another perspective.