The quality users are trying to express is: genuine, real.
"Those two police officers were really down to earth, weren't they?"
"This ski lodge has down to earth feel to it, don't you think?"
"Rainbow is one of the most down to earth individuals I know."
"Say what you want about George Bush, but he's a down to earth kinda guy."
"The astronauts were the down to earth sort"
"REI and Eddie Bauer outlets have a down to earth feel to them."
She's too down to earth you may need to do a drawing, so she may understand.
Lincoln used to plant his own garden.
This book is really down to earth; any child can read it.