I understand the importance of knowing specific areas well, as this would make my life easier, but I also think that with the technology we have nowadays (maps, street view, market analysis, etc), some research and a rigorous approach, this is something that could produce very interesting results.I'd like to know your thoughts, investors!

Obviously my approach is just my view and you should decide what is best for you.  

My view is that in order to really make this work, there is a minimum fixed cost of involvement (in terms of time and education) but it scales well, so it's efficient to do this in scale.However, in doing that analysis, it's hard to project what profitable deals will look like if interest rates are materially higher than they are today.

If you intend to pay all cash, then you won't have any financing to describe in paragraph 4.  

Would love additional views on how best to structure my small portfolio in order to be best positioned for a downturn that will surely come.

Upon viewing your numbers I stop and wanted to view post you previously made. 

The school I am near has a list run by the school which a landlord can list their property and have it viewed predominantly by students.

Psirri is lovely for shops, restaurants and cafes but I would not personally view it as a good option for renting thourghout the year.

So if an investor provides 250k for me to buy 1-4 family properties, or small mixed use properties - is taking a 15% stake reasonable or excess to perform the described functions (assuming investor agreement).  

@Benjamin Voorhis - it works more or less like you describe.