Mind you, with mortgage interest rates in the US being so much higher now (and seemingly for the foreseeable future), I wouldn't be surprised if LTRs in Europe would cash flow better than in the whole US nowadays (to be verified).This being said, I don't and would never invest in LT rentals outside of North America  as I wouldn't want to face unfavourable landlord/tenant laws as a foreigner.

Too hard to be able to ferret out the good and bad areas from 3000 miles away.

Medford (North Boston) happens to be a low supply/high demand market so I absolutely need to get more comfortable with consistent rent increases but those increases need to be researched and in line with the market. 

To learn more about which one may be best for you, feel free to send me a private message.Old Town North: An Unused Eye Soar Transforming into a 2.5 Million Square Foot Community CenterThe GenOn coal power plant, which opened in 1949 and was shut down in 2012 due to concerns by residents about local pollution, has occupied an unused 20-acre lot in Old Town North for the last 12 years.

We invest in 38109 on a limited basis when a client requests properties in the area, but further north and east.

Are you thinking vacation rental or long term rental if you are going north? 

The Columbia market -- specifically West Cola, Cayce, North Main, toward Camden, etc. -- appears to have some properties that would cash flow well, but may be limited on long-term appreciation.I'm looking to stick to market-rate properties.  

If so, then find out if you are close to any hospitals (within 15-20 miles). 

They're prolific up north, yes, but here in the south, there just aren't that many.

Maybe this is neighborhood specific, but most of the SFH within a few square miles of me sell with ADU price per square foot the same as the main house.