So it turns out that the usage of google maps is not easily possible anymore and you are bound to pay from the very first page view which uses it.
Setting up a new wordpress website for the local amateur observatory, the Hans-Zimmermann-Sternwarte in Braunschweig-Hondelage, I was looking for alternatives – and OSM has been on my radar for some time (and I have been using it somewhat, yet infrequently). A good time to take a more closer look at it and how to utilize it.