Not trying to be negative but just make sure you don't put every cent you have into when you buy the property.

They had negative cash-flow and lost equity to the point they were upside down.  

With a high HOA and always the potential for future assessments when renting at a net negative, just sell it and get what you can and chalk it up to a learning experience.

There are things on there that impact you negatively even if you didn't do anything wrong. 

Headline (total) inflation for the past month was negative, -0.1%.Core inflation (total inflation minus food and energy) was up only 0.065%, so it gets rounded to 0.1% increase.

But you will have to hold the property several years to get your money back, often with negative cash flow. 

If I have had a negative tenant experience (late payments, hostility, drug use, damaging property, etc) one of the options available is for me not to release.

Generally a higher cap rate indicates a lower credit tenant which indicates a higher risk to the property owner. a 10 cap is a great deal until the tenant goes out of business and leaves you with a Negative 10 cap as you are on the hook for all of the expenses associated with ownership.You should consider creditworthiness of the tenant first and foremost. 

They all generally seem to be negative cash flow about 99% of the time.

But when I check them against the bigger pockets calculator, I come up with negative returns.