Hey guys,
finally found a way to connect my google sheets data with PowerBI.
FYI: (basically import your Google Spreadsheet data in form of an html table)
1. edit the Google Sheets URL:
https://docs.google.com/spreadsheets/d/unique_key/edit#gid=1577191355
and exchange"edit#" with "gviz/tq?tqx=out:html&"
https://docs.google.com/spreadsheets/d/unique_key/gviz/tq?tqx=out:html&gid=1001054123
2. chose "New Source" -> "Web" -> Done 
This works fine in PowerBI Desktop, but as soon as you try to update your report in the service there is an rror, which I can't manage to overcome.
The basic queries (no promoted headers or filters) runs into the following error:
The 'Column1' column does not exist in the rowset.
If I promote the headers in the query, the following error occurs:
The column 'XXX' of the table wasn't found.
Already tried to find a solution, but the only input from MS on this isue was:
"To resolve this issue, edit the data mappings for the affected tables. Or, remove the tables and then re-import them."
And that didn't really help me.
Any ideas?
Best regards,
Sebastian