Thank you exactlyaron for this review. I think that the Elite treatment was really below average, reading you. I have stayed once in this hotel 3 or 4 years ago. It was OK but was not over impressed (no upgrade). But I would return if needed as I think this is one of the best Accor option in town. As you said, location is nice and you can walk to every touristic spot.
For the issue you encounter with your key card, this is very common when you request a late checkout. Keys are programmed until 12 usually and when you request a late checkout, it is always advisable to ask the front desk to reprogram your card.