We spent a week at the Mercure Avignon Centre Palais des Papes earlier this month. There's nothing about the hotel that would justify a full review, but it's a solid property in a terrific location and we'd happily book it again.
I was expecting the hotel to be full, because of a conference at the Palais, so booked a "Privilege" room rather than hoping for an upgrade. Platinum status is probably the reason we got allocated the room on the highest floor of the older 'wing' of the hotel, complete with two pairs of full length opening windows overlooking the Place de l'Horloge. ^ The fridge was large enough for a couple of bottles of wine and some basic supplies.