Over the last 3 months, I’ve moved 4 of our 12 units over to a property manager.

Perhaps you mean, what would it be wise to know about the property.

As a lot of real estate investors already know (and newbies may have heard), some tenants are very hard on rental properties. 

Hi Kevin,Great question... finding the right property management (PM) company can make or break your investment strategy, especially in Orange County (OC), where the market is both competitive and unique.

Sounds like you got a property with minimal out of pocket.You could try posting the room on FB or Craigslist.

I believe the property manager needs be on island (but i could be wrong).

If you want to provide your property's address, I can give you some additional feedback. 

Curious if there was anyone on this forum currently AirBNBing properties out in Portugal, whilst living in the US or outside of Portugal.

When buying a property I really do not care who the seller is. 

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.