A really charming spot. Luxuriously comfy bed and the hosts have a great taste in furniture and design. The shower was ample and hot, a wonderful treat given that that is not always common when travelling in Mexico. Eating breakfast at the cafe right outside was indeed delightful. Windows in each room made it easy to regulate temperature, and while I didn't need them I found it very thoughtful that the hosts had left both a fan and a space heater in the bedroom.
It is true that given the central location, it was fairly loud with ambient noise into the evening (at least midnight/1am or so) and somewhat early in the morning. But then again it is Mexico City and it is a trade off for how conveniently situated it is for restaurants, metrobus stop, etc. Also note that with its ground floor location (with a bedroom that faces an internal area of the building near a doorway to another part of the building) others who live in the apartment may be coming and going fairly close by. There were solid curtains to help with privacy. The plus side of the ground floor location is that there were only a couple stairs in order to access the apartment--it would be well-suited for someone with mobility difficulties.
The hosts were excellent and practically instant communicators who were very accommodating with my requests. I booked around 10:00am the same day and they arranged so that I could drop my bags and grab keys by 12:30 which was wonderful.
While I was just in transit staying for one night, I could be see this place being especially ideal for first-time travellers to the city who want to take in all the sights and nightlife easily and comfortably.