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http://www.lfgss.com/comments/9938274/
and the following comments.
Their main disadvantage is that they do not scabble to the width of the machine,
the one rive-gauche links to leaves 54mm at the edge,
and you wouldn't want to scabble your front door threshhold!Your 7(?)M^2 is only a couple hours work,
including your learning curve,
so you might be able to negotiate with the downstairs neighbour.
Didn't know they existed, that does look like a faster route to a flat and keyed floor.
I could take back the exiting parquet ~30cm and then level to the screed which it sits on.