FYI, I have used this graph template in the "Infobox building" in elwiki and now we have some dozens of articles displaying locator maps with this. It works great!
Topic on Template talk:Graph:Street map with marks
Awesome! I have been experimenting with using the new datasets feature, so that the same data can be shown on multiple pages/wikis, auto-localized --
-- uses https://commons.wikimedia.org/wiki/Data:Sandbox/Yurik/Street_map_with_marks_sample.tab