OpenStreetMap is straight forward. All you have to know is the GPS coordinate of the center of the map.
Source
<p:growl id="growl" showDetail="true" showSummary="true" globalOnly="false">
<p:autoUpdate />
</p:growl>
<pe:osmap style="width:100%; height:500px;"
center="42.3402,-3.6972"
zoom="17"/>