I think this was a great post. It can give people a realistic idea of how things can go in a C grade asset class. 1 thing to note is how difficult is it to lease a property. The sort of vacancy you had are very realistic. If you hire a property manager they will ofcourse try to find the right tenant but are not going to work for less than minimum wage to do so. Hence the issue with C grade rentals. I will say if you get into a higher asset class it really won't matter near as much if you happen to be in a landlord friendly area or not as long as adequate leasing is done which at that point a realtor or pm should be able to do for you.
The biggest lesson about asset class is the key. As times goes on things will get more tenant friendly in all areas so the biggest thing to do is not rely on having that save you because you are expecting legal troubles.
Whether you stay in small single family or go into multi family I would recommend keeping in mind the asset class and physically go to the properties you will be buying to ensure you are buying what is being presented.
I would stay local if possible or semi local within a state or 2 to ensure you can control things easier. I understand a low price point is great but I think you learned about the real ramifications from this property you just sold.