HOMi, as others have mentioned, is a professional operation offering several apartments in the complex. This is good because there's always someone at the front desk and I was able to drop my luggage off early while I waited for my check in time to roll around. The downside is that the kitchen is stocked like a hotel room, with limited vessels and dull knives.
More positively, enormous windows allow plenty of light in and are a back from the street, so you're not giving up all your privacy by opening the blinds. The bed is also huge and very comfortable. The shower too.
The neighbourhood is a little bit away from the popular area of Roma, but this means you get access to the local market, people, and prices. There is a subway station nearby, but I found it quite economical to get an Uber to the Museo de Anthropologia and Historical Centre, usually for less than MEX$100 with a tip. I walked home at night from these areas and always felt safe.