Duplexes cash flow better, have less risk, AND EASIER TO MANAGE compared to a SFH.  

Instead of a co-host can you just get a property manager that specializes in it?

I used to help manage 30+ STRs in the city with a McSwain Management.

And I certainly wouldn't have survived it with no investor losses, as I was able to do thanks to having a manageable portfolio at that time.All that is to say that I wouldn't change a thing.

Your experience reminds me to manage the portfolio well (i.e. sell losers) and to be patient. 

I stared using this site PropJump.com to find services providers for my 3 properties I own and manage. 

The investor manages the project, and the lender receives a percentage of the profits upon sale. - The property is renovated and sold at a significant profit, and both parties are satisfied. 5.

We play matchmaker, put our clients first in all arenas, and also manage.

Self-Employment Opportunities: Would it make sense to start a side business related to my rental properties (such as property management) to access more deductions?

The local property will give you practical management experience.You might do better buying a REIT if you are planning to buy single properties far from home.