The other advise given below is great too:)
http://gismaps.oaklandnet.com/crimewatch/. I usualy advise buyers to check the area they are looking in, and then check other areas that they already know and think are safe and feel comfortable in and then compare them. Another thing to check is the boundaries of the elementary school. When people refer to Redwood Heights, they usually mean within the Redwood Heights School district.
It has easy access to 580, and 13, the shopping center there and the closeness to Laurel. Some area's of RH have great views too. If you go too far south, where 13 and 580 come together, you may have some freeway noice. Let me know what specifically you were thinking of and I can assist you in your search.
Everyone who I know, who lives there, loves the area. You can check out crime statistics at City of Oakland website. You can draw a map and track reported crime in a very specific area.
best of luck