I usually take a database of cheap eateries with me IN CASE I can't find anywhere reasonable - in Ghent I found the one place I had listed and did not realise it until afterwards.
This is very much a Flemish place with good local items. The à la carte items are much the same price as other restaurants but the menus are really good value, not one whit worse in terms of quantity, quality or accompaniments than the same items à la carte.
Vegetable soup, Gentse Waterzooi of fish, an ice and coffee cost me €16. This was one of about six menus which ran from €14 to €16. However there was one even better bargain available the first night but sold out the second which was called 'Menu of the day' as opposed to menu! It consists of a soup for the day, the plat du jour, ice and coffee for under €10 or just the soup and main dish for under €8. That night it was vegetable soup followed by steak and a mushroom garnish and, honestly, it was really top quality.
Add to that the fact that it is ideally placed for a walk round the main floodlit buildings and, as the saying goes, 'Bob's your uncle.'