Whenever you get a recommendation, always check them out online especially if you don't know the people recommending them. 

It's worth mentioning for other readers that, while it doesn't hurt, it's not necessary to be a resident or to own a Mexican corporation to buy real estate in Mexico and any non-resident can own a Mexican corporation anyway.To answer your question, depending on your strategy, you have various options, depending on your objectives:* Other beach resort towns whether in Q Roo, Baja California Sur, Puerto Vallarta - Riviera Nayarit, Mazatlan or the Oaxaca Coastline.* Inland cities like Mexico City (the capital), Guadalajara and Monterrey (the 2nd and 3rd cities who are benefiting from the onshoring/reshoring/nearshoring boom and the rise of the middle classes), San Miguel de Allende or Merida.Hope this helps otherwise feel free to reach out.

Higher end relatives coming to visit would want to stay at a home.Did you check AirBnB to see the calendars of the homes in the area?

I would most definitely check on the property first.

So I would start there, invest for equity and net worth, cash flow will come later.

Have they ever paid rent with a check? 

I will check them out

Check in with @Joseph Chiofalo for Pro Forma support and analysis he can help plug in loan terms with investor friendly financing. 

You can also check meetup.com or search Facebook for real estate investment groups, clubs, or meetings in your area.You will learn faster if you rub elbows with people that have been there and done that.

I'm not sure if it's worth it to convert they downstairs to an ADU so I could get another renter - the city of S.F. would probably call it a 2 unit not a SFH and I'd be under rent control.