Meeting Room

A church
Public toilet
Your sitting room
Your kitchen
Train station waiting room
In your car

And this is one sure fire way to impress your clients - find some cheap, free, anonymous place to meet.

Either rent an office for a couple of hours (www.regus.com), use a hotel, meet at their place, or their hotel.

If they are worth the trouble of meeting, they are worth the expense of a decent meeting room.

"The Library Brussels" offers decent rates https://www.facebook.com/pages/The-Library-Brussels/350281761752786. As J said, if they're worth meeting, I can't imagine why you wouldn't want to invest in it.