@Clarence Watkins This is what I use to classify the neighborhoods, which I found of BP Forums (As well as qualified property managers to let me know).
A - this is where you and I want to live (lowest crime, best schools); appreciation is very good (generally highest) and cashflow is either negative or very little; ideal for fix n flips if you find that "sore thumb"; best for new builds
B - low crime, good schools; with some appreciation and positive cashflow; lots of homes are owned by first time home buyers in addition to renters with stable jobs/ good incomes; good for fix n flips as well
C - some crime, OK schools; little appreciation and very good cashflow; renters with OK incomes; ideal for buy-and-hold specially if area is changing or becoming a B area; you can get very good ROI even for turnkey properties if you're in this area
D - high crime, bad schools; no appreciation and very high cashflow; mostly subsidized housing; to succeed with this, you got to be a "hands on" landlord and literally live close by; lots of boarded up houses (one boarded up per block)
F - this is where the most violent crimes are committed; negative appreciation and the highest cashflow; every other house is boarded up; you either get shot or get stabbed so be careful so wear a bullet proof vest:) PMs don't even want to be in these areas