Out of the Hotel MX locations I've tried, Hotel MX Reforma is arguably the best when compared to Hotel MX Roma and Hotel MX Condesa.
The location is fantastic, next to the Angel of Independence and close access to nearby WeWorks. The room was clean and had the most space out of the three, and my room included a balcony with access to fresh air. The shower head was nice and had good pressure/temperature. It was a quiet and restful stay especially compared to the Condesa location.