Flávia, around these parts, "one-click distance" means one kilometer away. Often spelled "klick". I haven't heard the expression in ages, but it's common.
The old printed Yellow Pages business telephone directory used to advertise its use with the slogan "Let your fingers do the walking" -- meaning, look it up in the phone book and phone, instead of physically walking to stores to find whatever you're looking for. How things have changed, or not!