@JasonTurgeon. I definitely use Excel and run numbers on all my properties. I thought it was too much info to include in this one post. I do self-manage. Everything has been rehabbed and I am very careful to put very good tenants in each apartment who I know will take care of the place. So the management is not a big deal at all, and I don't mind it. If you take into account everything (including vacancy, which I don't really have, maintenance, cap ex, and even property management), I am cash flowing around $200 - $300 / unit. So, you're in the ballpark with $5,000 / month cash flow.
Regarding my single family--you are correct, it doesn't currently make sense. I inherited a tenant when I bought it, and have just been sitting tight on it. I am waiting for the weather to break (Spring 2020) and plan to flip it. I bought it for $110,000, and plan to put around $50K into it. Comps are as high as $240K. Then, I'm planning on using a 1031 tax exchange into another multifamily. I got my realtor sales license 2 months ago, so I figure I can save some money on the commission. If it doesn't sell, I think I can rent it out (rehabbed) for around $1,650 - $1,750.