It seems like this is highly shark-infested waters, with lots of scams and scammers, and the actual information is difficult to obtain...

Greg Schwartz is not liable for the stress from difficult tenants, late-night rehabs, or cockroach infestations.** 

They are looking to make the move to join up with the adult daughter and so their 7 year old can go to the local school district, which has good ratings.I also learned that the adult daughter is looking to move from her current apartment which is in the midst of a bed bug infestation.  

Common problems are sewage backups, mold, infestations of rats, and other pests, faulty wiring, roof leaks and it violates the city’s building, health and fire code poses health and safety risk.

Beware of bedbugs getting on your clothes and you transferring them back to your own home- if you wear a haz mat type suit the renters will feel like something is wrong and feel very uncomfortable- but in some heavily infested situations it might be called for.

Personally, I've been investing more than 50 years and never looked at the demographics for a neighborhood one time because I always felt that you need more personal knowledge about the neighborhood e.g. whether it is blue-collar working people, whether it infested with gangbangers, what the ability to increase rents is, etc. and the only way to get a good feeling and understanding is to personally visit the neighborhoods in the daytime, evenings and on weekends because weekends and nighttime is when the bad people come out like cockroaches.

I am working on a remodel project for a property which turn out to be a nasty house with poop infested.

In between my agent and I would walk houses where human feces was smeared all over walls, flea infestations were so bad you had to spray yourself down in the front yard when you came out, and rugs with years of dog and cat urine baked into it.

I also had non-paying tenants that owed me, HVAC unit needing replacement, large trees hanging over property structure that suddenly died due to beatle infestation and college tuition due all at the same time.  

The only areas that really scare me off are major crime infested areas.