I just completed a two night stay at the AC Ciudad Seville. We were there for the start of Seville's April Festival. I did not really care for this hotel and found it to be the worst on our trip throughout Spain. The finishing of the hotel (walls, paint, carpet) seemed haphazardly done (did not look professional and up to Marriott's standard) . The halls were extremely dark and did not have adequate lighting.
Aside from these flaws, the service and staff were great.