Hi @Dante G., sorry for the delay in getting back to you. Had my first kid last week and obviously got a little distracted!
I second (or third, or fourth) the advice you got from @J. Martin and @Arlen Chou. I was pretty certain I would enjoy living and investing in North Oakland, so my wife and I rented here for a couple years to explore the neighborhoods, understand the nuances between those nuances (or even between blocks within the neighborhoods). We tried to understand where things were and, more importantly, where they were headed.
If you're not ready for the type of reconnaissance that J. and Arlen suggest, or moving into a neighborhood, you can still get enough information to decide if you'd want to live there. I, for one, went to every open house I could, even if I had little to no interest in the building. I wanted information. I set up as many one-on-one showings I could, preferably on off hours so you can really get to know the seller's agent. Coincidentally, that fortuitously lead to my first off-market deal. Also, go to broker's open houses as well, usually mid-week, if you can swing it. The hard sell is not on, so you can usually pump people for information, meet the seller's agent personally, and talk to other brokers (who, you might expect, have their own deals and information).
And if store clerks and mail men still seem a bit of leap right now, you can still pump your friends and friends of friends who live in those areas for their thoughts. That often gives you a lot to work from.
Sorry if this isn't as detail or helpful as you might like. But I love connecting with other Oakland investors, so let me know if a call/coffee/beer sounds good.
Good luck!
Brent