text: I wanted to add a grass area here. Seems like I'm not capable of doing such edits yet.
  I looked at other grass areas and always found the tag landuse=grass.
  However this doesn't seem to render correctly.
  Is it because of the other tags.
  Furthermore this is not only a grass area, but a multiuse grass area belonging to the nearby playground.
  It's popular for playing soccer, but there are no goals and it's designed as a general "Grünfläche" (not sure how to translate that: maybe "green area")
  I will try to investigate further on how to tag this correctly, but if anybody has got an advice I would be very thankful.
  Thanks