FYI an agent or Realtor should not classify the neighborhoods. Any agent that tells you that they will only help you find homes in "good" neighborhoods are "redlining" (steering). I can give you the tools to help you find a good investment.
DC is a hot area period! There are a lot of things happening all over, you just have to have an agent that knows DC and what's happening here not just one that's out to make a quick buck.
DC can be expensive so for the most part if you are spending $150k you can figure that you are buying a property in that price range will need at least $40k + of work unless you are looking for a Condo. Believe me I have worked with investors and I have owned and operated a GC Company. If you are not currently working with an agent give me a call and lets talk.
That is, 150K may get you a 1 bedroom condo in DC but if you finance the purchase you could easily get a 2 or 3 bedroom unit that will generate a lot more rent, appreciate faster and likely will attract better tenants.
Feel free to contact me if you would like additional information about my suggestions. I have been involved in about six transactions in the past year where this strategy was used and the results have been satisfying,