I am here for 2 nights. SNA was denied and I was assigned a regular room facing Bourse. As everyone commented, the hotel is tired, but Brussels is one major European city that is lacking in good hotel affiliated with a major chain.
Taxi driver said the hotel should be called Marriott Bourse and not Marriot Grand Place. Location is very good, close to Grand Place with many restaurants and supermarkets for stocking up on beer nearby.

Executive Lounge is still closed, and 750 points as compensation is a joke, Breakfast buffet is OK. Staff are all very friendly.