If you just take the 13,835 financed at 6% you are adding 83 dollars a month. so a double whammy.Now, lets consider if rates drop to 5.5% in 24 months (not a prediction just a what if) and you could have refinanced at a much lower costs then the above scenario in what you paid in pre-paid and additional interest. on the other hand, if rates for your same scenario after your 5 year payback period is 9, then you will have an asset with a much lower then current market rent.  

So your additional ~240 SF could be the foyer, hallway and bathroom spaces that are allocated by percentage to the unit.

You can assume about 1% in closing costs in addition to commissions so you're starting around 7% before the seller gets any cash at closing. 

If they have a loan at a favorable rate, I give them additional money to take over the loan.

This money will be used to pay down some debt I have and also purchase 1-2 additional rental properties.  

I track the principal as a Liability account in Xero, and whenever I add it to a report, it always shows the current balance, rather than the change over the chosen time period (like with expense accounts).  

However, you have the additional question about if and how you might enforce a judgement in another country. 

Homeowner should have an adequate policy and you can use additional damage protection from services like Safely and Waivo.Yes, security deposits are normal for MTRs and highly recommended. 

Additionally, it pretty much the 1% rule as a LTR and would absolutely kill it as a MTR/STR!

If you need any additional help I will tag @Crawford Peay who is an experienced  property manager perhaps he can help.