Text and Data Mining valid from 2019-10-01
First Online: 11 October 2019
: V.T., A.W. and E.F. declare no competing financial interests. T.S. and S.S. are co-founders of and hold shares in Amphiro AG, the small to medium enterprise that manufactures the smart shower meters. T.S. and S.S. were not involved in the data analysis, hotel selection or room assignment.