The piece is not for piano solo. There are a beautiful accordion and chimes added.
Frahm plays the piece piano solo in other versions.
On the Spaces album he plays the piece as a 'Unter Tristana Ambre-medley', this way.
About the sheet: I choosed 3/4 because Nils Frahm says 'drei' before he starts playing, but 6/8 can be heard too, certainly in the middle of the piece.