We really enjoyed our stay at Guillermo and Teresa's! Teresa received us personally when we arrived, and allowed us to store our baggage in the main house while we waited for check-in. Communication via the Airbnb app was good with both Guillermo and Teresa, and they were more than accommodating of any needs (e.g. we asked for an umbrella, and they kindly provided one). The loft is small, but had everything we needed for our one week stay. We did mostly go out to eat during our trip, so I can't comment on the kitchen amenities, but I imagine we would not have had any trouble cooking something simple. The outdoor spaces are so lovely to spend time in! We never had a problem walking in and out of the family home. The location was good too; close to lots of restaurants and bars, and a 20 minute walk from the Roma Norte neighborhood. Very safe neighborhood--we did not end up having to put in our fingerprints but just used a door code. The only things I would note as points for improvement would be the shower pressure and occasionally spotty WiFi.
Some things to note: We stayed here in June, so the afternoons do get warm, and as the loft gets a lot of light, it can get hot in the apartment. AC isn't common in CDMX, but we thought the fan did a decent job in keeping us cool. The loft is also up 2 flights of stairs, so not the most accessible for certain folks, but we didn't mind at all. Lastly, the family does have a dog, and while there is a fence that is supposed to keep him from the loft, he can easily jump it and come up to the terrace. We had no problems with him, he's very sweet and well-behaved, but other guests might want to keep this in mind.