Yup, you don't want to hang around right by arrivals because it is already busy enough with gushing people that have not seen their loved ones for a whole weekend.
If you come through customs, bear right and go up the escalator, turn left at the top and walk away from departures then there is a place on your right called Crepes and Waffles. It is up some stairs or an elevator but adequately signposted. There whoever arrives first can sit down in relative tranquility and have a drink whilst waiting.
Alternatively, if you are sufficiently convinced that you will arrive at roughly the same time, you can meet in the baggage hall, you walk in then on your right about half way along there is a bathroom with a small duty free outlet next to it. That would be tricky to miss.