Definitely tread gently/lightly and strategically for all the wise considerations here2.)

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

I know software like this is only designed to do a light scan across markets before diving deeper yourself, but I'm starting to wonder if it's even that helpful as a first step. 

You will have some fixed costs (who is paying landscaping, whether or not the property is occupied), who is covering the "house meter" for common area lights and electric, or unit utilities when vacant (unless you want to show a unit with no lights on).  

My wife and I have dreams of moving and investing in real estate in Portugal and wonder if any of you fine folks may be in Portugal to help relay some information about the market and potentially shed some light on the “Golden Visa” I keep reading about. 

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

Your opinions have encouraged me to believe that I am thinking of this in the right light.

Add can lights in the kitchen (really cheap to do nowadays).

Good general lighting is provided by 12 new LED light fixtures.

- Both bathrooms brand new top to bottom- New flooring and painting throughout the whole house- Updated kitchen with custom island and all new appliances, granite countertops- New lighting fixtures- Opened up the floor plan, etc...