Also, there are more things to consider than max ROI.Most people start by picking a particular type/style of property that they like for some reason (usually a gut decision).

You can't compete against the all-inclusives unless you offer complimentary food and booze or you're cheap, as you seem to be confirming.This being said:1) Properties in Mexico/Cancun trade in USD so you have no foreign exchange risk in Mexico while properties in Colombia are traded in COP, the Colombian peso, which has been tanking over the years, eliminating any hope for capital gains for American investors.2) You can get a mortgage in Mexico but you can't in Colombia so even with lower revenue, Cancun would likely still be more profitable, even if you don't take capital gains into account.3) The political risk is much higher in Colombia, especially at this present time.Is Cartagena a bad investment?

By the time 2025 rolls around, you’ll be well-prepared to make informed decisions.

I'm contemplating this decision because I'm not sure if it would be desirable for tenants to have an extra room instead just a loft area.

But ultimately, that's a decision you need to make with your attorney. 

I made the decision to purchase a 6 unit building with those funds that will eventually cash flow $4200/month.

You will likely make bad decisions because of that.

Be sure to really dig into it, talk to others in your market, and make an informed decision.

if you can tell the future with 100% accuracy sure it would be an easy decision. and yes, for some buying down a 1-3 points can absolutely make sense.  

I heard that phrase a while back (I think it was a BP podcast) and it stuck with me.This has been a long time coming, but my wife & I finally worked ourselves to a position to make that decision.