I was working on a matrix Visual and needed to add a simple linebreak to the text in the values section. To do this is actually really easy.

bookingstitle = 
CONCATENATE(timewax_planning_bookings[resources.bookings.projectName],
CONCATENATE(UNICHAR(10) &" ",
CONCATENATE(timewax_planning_bookings[resources.bookings.from],
CONCATENATE("-",CONCATENATE(timewax_planning_bookings[resources.bookings.to],"")))))

You can use the UNICHAR(10) code to add a linebreak into your text. 

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