Best neighborhood around Pittsburgh to investor who wants to buy and hold?

[Cj Yu]

Wonder who can give some advice about which neighborhood close to downtown Pittsburgh is the best to invest in.

We wants to buy our first rental property (eyeing for residential/ multifamily). It's a side hustle, so we are not flipping. Ideally we want to find long term tenants. Any ideas? What factors we need to consider? 

Thanks!