With this 'Ruimte van West' (West's Space)-app you can download audioguides/citywalks for Amsterdam's 'Stadsdeel West'.
Just browse to the 'City Walks'-tab to explore available audioguides with maps and navigation!
You can also explore interesting places to visit while you are exploring Amsterdam West. Tune into the 'Places'-tab for that.
All audiocontent, images, routemaps, etcetera are offline available, once you have downloaded them. You can safely switch off roaming, preventing mobile-data carrier costs and still use the app.
Have fun exploring Amsterdam West!
Note: Continued use of GPS running in the background can dramatically decrease battery life.