Following up with the Wirecloud User Guide to build the mashup illustrated for Santander City. I added the settings as described and I can confirm the map widget is centred in the new location, Santander on Reload.
However, after adding the NGSI Source and Entity to PoI operators with all settings as described therein, the map didn't show the PoI in the Editor View as shown on the User Guide.
Widgets/Operators versions:
Map view: 2.6.2
NGSI Source: 4.0.0
NGSI Entity to PoI: 3.1.2