Here's a few things that help me: For macro industry trends, I like the STR Data Lab podcast by AirDNA and Jamie Lane. 

Parts of this country haven't rebounded from the real estate market crash.I do wish I had spent more time setting up my lab to mine both BC & LC.

The rental house is 2 houses away from a house that had been a meth lab, and there is still dealing going on across the street from the subject house.. 

They have used Guesty, Hosty, and price labs to name a few. 

@Jay Fayz for SFR (1-4 family) Classifications are mostly opinion-based.Not aware of anyone tracking eviction rates, except Evictions Lab nonprofit that doesn't like landlords.Here's some info that might helpt:---------------------------------------------------------------------------------------------------Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

Quote from @Craig Jones: For chemistry nerds:A salt water tub uses a cartridge with titanium plates in it.  

The right chemistry can accomplish incredible things.

Princeton University’s Eviction Lab estimates 1.5 million Americans face eviction annually.

If you decide to go the multifamily route, Real Estate lab .com is a multifamily software for deal analysis plus they have many other useful features. 

She's has an enormous dog (lab) at the house so I didn't attempt to go there to post the notice on her door as he had bit someone before.