Terrific location for a first-time visit to CDMX (close to the Cathedral, Templo Mayor, Presidential Palace) and walking distance to Palacio Bellas Artes, Tile House, and Museo Nacional de Arte. The Zocalo is busy during the day and had concerts several nights, but the area gets pretty deserted late at night (plenty of police presence, however).
The hotel staff are wonderful, very helpful, speak excellent English, and were very accommodating. The hotel is a large former department store with impressive glass roof and iron work throughout. The rooms were spotlessly clean, if a bit dated. Super-comfortable bed! We chose an interior room and appreciated the quiet. It was a suite with large rooms, a separate sitting room with TV (allowed one of us to sleep while the other watched TV). Full Netflix, etc.
La Terrazza restaurant/room service was good, if somewhat uneven from night to night. Has a great view of the Zocalo and surrounding buildings, which are illuminated at night. The breakfast buffet is ample, but not cheap.
We stayed at the hotel in January, so it felt somewhat empty, especially at night. The openness of La Terrazza meant it was chilly some mornings and late evenings. Note also that the streets leading to the Zocalo are closed to vehicular traffic, so grabbing an Uber meant walking one block to the nearby Nike store. Not a problem, and staff are available to assist with luggage, if needed.
All in all we enjoyed our stay at the Gran Hotel Ciudad de Mexico.
