Most of the time, it's always been work, work, work, and I never saw the outside of the hotel room and the office. Might as well have been in Cleveland. Twice, though, I've managed to schedule the trip near a weekend, and was able to stay over to see some sights. I wrote an email to my sister on returning, and a copy of that account is here . Second time Jeannie came with me, and links to some pictures and descriptions of that trip are further down on this page.
Rooms are sort of average.
The Marquis has very nice rooms, great location. Restaurant is so-so. For the most part when I've been there, I've been working 'til late at night, and have mostly done room service or eaten in the hotel restaurant. Can't vouch for the food, but a great place to get a drink is the Majestic Hotel 's rooftop cafe . It' s right on the Zocalo, about 7 stories up.