We stopped here for our last 5 nights in Mexico. The hotel entrance is tucked down the walking precinct so our taxi driver missed it on the first attempt! Reception staff were welcoming and we were shown our room on level 5 with a window onto the central atrium. It was noticeably old, with worn carpets and a very dated bathroom. The carpet had quite a lot of hair and debris in it, like it had not been vacuumed for a while. We thought this may have just been missed and maybe done the next day, but did not seem to have been done at all during our stay.
The atrium can be quite noisy as sound echos from the seating area on level 1. This was really noticeable when chairs were moved, screeching on the floor, I do recommend ear plugs.
Hot water seemed a little erratic, sometimes just luke warm, but ok for most of the time. The rooms facing the zocalo did seem more modern and well kept from the little we saw.
For the price we paid, we would have rather had a newer quieter room at the Hampton by Hilton just down the road, this appeared to have much nicer rooms for a similar price.
Then if you fancy a view of the zocalo, you can always go to the Zocalo Central Hotel for dinner!