Interior and concept are quite casual so it's easy to visit with friends but I wouldn't go with (grand)parents or on a date.
There's a fixed menu and there are daily specials. The Syrian wrap really is the best, and otherwise I recommend the daily specials as they are often better than the fixed menu in my opinion. Vegan menu items are clearly marked, but the different types of sauce in jars in the refrigerator are not, so ask a waiter/waitress which ones are vegan. Everything is vegetarian.
They serve cheap dishes but also dishes over 15 euro's so I'd say moderate, in stead of cheap, to Belgian standards.
(By the way Greenway sells it's own products in supermarkets and their vegan chick'pieces are great!)
Cons: Sauce in jars not marked