I agree that working with people is easier and more cost effective than the alternative.As I read this, I'm considering creating a Cash For Keys written program that I can give my tenants at lease signing to remind them to come to me rather than just stop paying. 

https://retipster.com/164-arturo-paturzo/Your situation reminds me of this podcast.  

If your manager is just 'keeping an eye' on things, collecting/reminding on a few rents here and there and some light cleanup while being compensated in free or reduced space rent then classifying them as 1099 subcontractor is great. 

It’s a great reminder to trust your own due diligence and not let others make critical decisions for you, like hiring a property manager.For future investments, building a trusted team and maintaining direct oversight is key, even with remote deals.

I had to remind them a few times of deadlines but they did a good job overall.

I would mention to Tenant B that I was visiting Tenant A and smelled what seemed like marijuana smoke coming from their side and remind them there is no smoking permitted inside the house.

This reminds me of how Alex Hormozie describes "the value equation"; Experience in this case is the factor that determines the likelihood of achievement. 1,000%Alex Hormozie is one of the greatest marketers not just alive, but ever. 

I knew that but seem to always want to be reminded.

Remind them of quiet hours, city ordinance, right to quiet enjoyment, etc.

As a reminder, listing tenure positively impacts your performance on our marketplace.