The first thing prior to this would be to verify this is a good tenant, check the lease, and confirm with the owner with a payment ledger that they have been paying on time since they have been there. 

Appreciate the feedback, checked out your post and yeah I've had similar with roommates in the past.

id love to check out your venue if you have a link you can send me!

So when you need to go check on things, rent units, meet contractors, etc, you're jumping in the car for 6 hours, spending 1hr there, and I'm thinking after a full days's work. 

If its trouble check on PM.  6. 

Not sexy but I sleep like a baby every night and cash those checks on the 1st of every month!!

Quote from @Zachary Kay: Hey @Sarah Larbi,I recommend checking out Second Street (can google search "Second Street Costa Rica" and you should find their site).

You can also check meetup.com or search Facebook for real estate investment groups, clubs, or meetings in your area.

Check it out.

Windows would be my next check-point (less than R1) and then wall insulation: I would not be surprised if they have no insulation inside, but you can do blow-in, which only requires a small hole.A home looses heat in two ways: heat conduction (which you can slow down with insulation) and drafts, which in old houses is usually the biggest culprit.