My guess is it wouldn't be as critical in an A- or B-class property as it would be in a C-class property. 

Furthermore, my advice is to pick a singular investment thesis or asset class.

@Jack Cottrell You Vacancy & Maintenance percentage are aggressive and may only work for a Class A rental/tenant.If the is a Class B or C rental that will attract Class B or C tenants, you should strongly consider increasing those percentages.NOTE: we deal with a LOT of Class B & C rentals, so we replace "Vacancy" with "Vacancy/Tenant Nonperformance".

Anyone trying to tell you a certain asset class is good or bad these days is probably trying to sell you something.

@Martti Eckert here's the big issue that no one really talks about that you hopefully find helpful (this is copy & pasted):-----------------------------------------------------------------------------------------------------------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?

One of the biggest challenges of investing in Rustbelt cities is knowing where to invest and properly understanding the cooresponding pros & cons.Here's copy & paste advice we share to help to address this challenge:-------------------------------------------------------------------------------------------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 Class A property in Class D area, what quality of tenant will you get?

Despite only renting for two months, this tenant's aggressive behavior is creating a hostile living environment for other residents.Specific Issues:He complains about our lack of notice when entering the property during our own move, despite prior notification.He has moved items around the house without permission.His communication has been condescending and confrontational.He installed a surveillance camera in a common area, violating the lease agreement.He banged on the door because he couldn't use the smartlock code properly.Considered Actions:We plan to serve him with a notice to vacate.We are considering having a constable with us when we serve him the notice.Questions:Should we just give him warnings considering that his actions may not improve?

I literally laughed through the phone at his suggestion, because I was broke, in debt, and in every way and unqualified borrower, and the lending environment in 2012 was probably stricter than it had been since the invention of the 30yr mortgage.

@Urvesh Patel recommend you focus on Neighborhoods, NOT zip codes.Zip codes are too big and in urban areas, often include Class B, C & D Neighborhoods.For MTR you'll want to focus on Class B, no lower than C+.

Other than the classes I am running for the hills!