This hotel is located just half a block from Mexico's Centro Historico Zocalo. The hotel is clean and it combines a modern style in the lobby with a traditional decor in the bedrooms. The staff goes out of their way to help guests although that is something you find in most touristic destinations in Mexico. You get free wi-fi throughout the hotel and in the bedrooms and it is surprisingly fast enough, considering wifi at most HIExpress Hotels leaves a little to be desired. The lobby has a "business center" consisting of about five pc's connected to a very basic printer. The PC's are slow and freeze constantly, making it imposible to rely on them for business. The rooms are very small but hey you're not going to Mexico City to stay in your room so if you can make do with the limited space, you'll be fine.
My key was also an issue as it got deactivated about 4 times on a 4 day stay!!! The receptionist apologized, fixed it but the key would stop working after a few hours. The cleaning staff missed my room the last day I was there, undid the bed, left everything on the floor, opened the windows of the room on an 85 weather day and believed I was gone, despite that my belongings were still in the room.
However, if you can overlook the operational failures of this hotel, you will be very satisfied at being right in the center of the Mexican Capital. The Turibus (Hop-On and Off bus) stops just one block from the hotel. Also, the subway station Zocalo is just a block away. It is noisy during the day as you can hear the "shamanes" at the Zocalo square dancing to perform soul cleansing rites. But during the night, this hotel is very peaceful. There is so much vigilance from Mexico's police around the Zocalo area that I felt perfectly safe walking alone either during the day or at night. There are several places to eat around the hotel including street taco stands and restaurants. I would recommend Sanborn's which is a Mexican diner located just three blocks from the hotel towards the Museo de las Bellas Artes. For breakfast, walk 2 blocks to Avenida Madero and eat at VIP's which is another Mexican diner known for their breakfast options. Their food is good and most importantly, clean.
The hotel has a terrace restaurant whose food is ok. The plus of this restaurant is its terrace as it has a perfect view of the entire zocalo square. Don't miss every morning at 8 am the raising of the flag and then at 6 pm the lowering of the flag by the Mexican Army at the Zocalo square. As you probably know by now the Palacio Nacional which is the Executive office of the president of Mexico is next to El Zocalo. Every day at the times described above, the army will perform a very pompous ceremony to raise and lower the flag involving about 200 soldiers. Tourists and Mexicans alike stand around the flagstaff to watch the ceremony take place. Moreover, you as a guest at the Holiday Inn Zocalo can watch the entire ceremony from the restaurant balcony.
This is a nice and clean hotel that is perfectly located. They have to work on some operational issues that definitely would not detract me from returning.