What part of town are they in? Always appreciated it when a first date/meet and greet made it convenient for me.
Especially since it sounds like you haven't met - choose something that can be over quickly without much awkwardness - like HH or the coffee/walk another poster suggested. If it's not a match, easy to spend the half hour and make a graceful exit. No hard feelings for anyone.
Maybe Swingers? The indoor mini golf - bar place. It's close near Dupont. Always like a first date that allows for being up and moving. Also good for seeing how serious people take themselves!
63brubaker t1_iy1ff2b wrote
If they're game for it, the sculpture garden ice rink is a great first date, and if it goes OK plenty of good places for food and drinks nearby.