Property: MonAsty, Autograph Collection (Thessaloniki, Greece)
Date(s): 1 night, June 2023
Room booked: 1 King Classic Room, Urban view
Room received: 1 King Superior Room, Urban view
Elite Level: Gold
Award stay: No
Rate: Member Flexible
BRG stay: No
SNAs redeemed: No

I initially was upgraded to a 2 Twin Twin Room, Urban view, but didn't like that so just rebooked myself into the classic room (again, and for cheaper), and got upgraded to the superior room.

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Property: Cardiff Marriott Hotel (Cardiff, United Kingdom)
Date(s): 1 night, June 2023
Room booked: 1 King Deluxe Room
Room received: 1 King + Sofa bed, Executive Room, Executive lounge access
Elite Level: Gold
Award stay: No
Rate: Member Flexible
BRG stay: No
SNAs redeemed: No

Coldplay was playing a sold-out concert the day I checked out. I'm positively sure that's why I got upgraded, because Cardiff Marriott is generally stingy with upgrades (this was my only upgrade in 7 stays)