Living in Sheffield Village
If you are interested in that area consider also looking into Oakland's Sheffield Village. It is a very family-friendly neighborhood, diverse, and in the San Leandro school district for at least elementary school (confirm separately for middle school and high school). Much of the neighborhood is flat, there is a community center and park with playground, as well as a community tennis court. Really fun spot for Halloween. The NX4 and NX3 Transbay buses pick up nearby - good for any SF commute and it is about a 10 minute drive to San Leandro BART.
You can easily walk to the same intersection (Estudillo/MacArthur). Estudillo Produce is a true gem - wonderful grocery store for organic produce, reasonably priced wines, deli sandwiches, and other gourmet foods. Sabino's is the local coffee shop and is very popular, as is Zocalo Cafe down at Dutton and Bancroft (better for actual food I'd say).
The best part of Sheffield and likely of Bay-O-Vista is that you can easily walk to the trails at Lake Chabot. We used to go every weekend - I can't think of a better way to spend the day with a little kid.