I have yet to find a walkable city in Indonesia, let alone South Asia that is actually walkable in comparison to European cities, like Amsterdam or Berlin. There is a major difference in population between those two though.

Istanbul has a similar sized population, and it felt more walkable and just a few good in public transportatiin than Jakarta (having spent a couple months in both cities). It may be due to good tram+marmaray in Istanbul compared to the BRT in Jakarta, and dedicated bus lanes don't cut it to Jakarta's traffic.

Nobody walks in Indonesia, it is too damn hot. That's why traffic is such a big problem, a lot of the walking traffic is replaced by vehicle traffic and so the cities are starting at a fundamental disadvantage.