It was on a Monday we decided to eat at HRC.
We did not make a reservation, because it was a weeknight (time 17:30) and we were confident it wouldn't be too crowded (and were right!).
The place looks great. Not too big, but very cozy. Of course you have the corner where u can purchase clothes & souvenirs. You can also seat on the terrace if you want. You have a great view of the plaza and the Cathedral.
We ordered the Jumbo combo (quite big portion), Chili spiced fries with chipotle garlic ketchup, Herb & garlic fries with chimichurri mayo and the mac & cheese (side dish). It all tasted very good!
For drinks we had some cocktails. You can have your drink in a mason jar you can take home and collect, but you pay extra for this. And if I'm not mistaken the price isn't mention in the menu. Our drinks were good too.
And staff was super friendly as well.
*if you are coming by car, mind there is a lot traffic and construction in the center of Antwerp. Easiest, cheapest & fastest way to get to HCR is to use the tram (2€).
If you must come by car, there are indoor/underground parkings, but they are expensive. For approx 3h we paid 10€.
There a place were you can park for free: Sint-Michielskaai, but it's a 15mim walk to get to HRC.