After expenses, it cashflows me around $350.

One rule helped here (I simplify a lot): you should always count how much money will be left in your pocket after all expenses (including mortgage payments, taxes, fees, utilities, as well as the reserve fund for the current repairs of the property).

Property managers can also be expensive.

A cost segregation study may allow you to deduct $150k in depreciation expense in the tax year of acquisition.This would create a large tax loss (notably different than an actual operating loss).

As far as a multi, personally if all things were equal I'd go for the multi for a few reasons.  1) Added diversification.. if one tenant doesn't pay, you can still cover property expenses with the other tenants 2) Shared capex... typically, one roof and one property to maintain but multiple streams of income 3) Less vacancy.. usually multi's rent for lower, for example one of mine is the sweet spot of 3 bedrooms for $1300. 

There are a lot of great articles out there, but sometimes it can lead you down a rabbit hole and it can get overwhelming. 

The most expensive way to generate business, the pro is that it can generate leads in 24 hrs or less.

Seems more like a preference rather than a way to lower expenses.

- Management fee percentage and what that typically includes (my company seems to charge a cleaning fee separate from their management fee, which I hadn't realized)- Additional monthly expenses (my company charged $200+ for a fire extinguisher inspection?)

Dealing with unreliable collaborators can be expensive.