This is a tough question. Everyone has different opinions on what they consider safe. In addition, Realtors are bound by certain Codes of Ethics that do not allow us to intentionally steer clients to a particular area, or away from a particular area.
I would start with looking at the OPD website for crime incidents http://gismaps.oaklandnet.com/crimewatch/.
Also the crimspotting website is a great place to look as well: http://oakland.crimespotting.org/
Talk with friends and co-workers as well. They can be a great resource to start looking in areas you are considering. Also trying to visit areas in Oakland is also a great idea. There are a lot of little pocket areas that are not always widely known that have very active community groups and are great places to live. (Diamond, Laurel, Maxwell Park, Temescal, etc.)
Craigslist along with sites such as this one (Trulia), Zillow, etc to post rentals. Some rentals are posted by owners, some are posted by Realtors who are listing the rental for the landlord, and others are being posted by rental management companies.
I actually have a lease listing coming up in the Glenview District. It is a two bedroom as well. If you would like more information, let me know.
Hope that helps!
Alain Pinel Realtors