I had an awesome stay at Minerva's place. It's a great little one-bedroom apartment in the Southeastern corner of Roma Norte. I was traveling alone and it was more space than I needed. It's ample for 1-2 people. You could probably even swing it for 3 if someone slept on the couch.
The neighborhood safe and the apartment is super secure; you have to get through 2 locked gates and the deadbolt on the door to get into the unit. I felt like my personal items were safe. You're within 1 block of lots of cool little restaurants and shops and about 4 blocks from Avenue Obregon which is kind of the main drag in Roma Norte. All in all, it's very walkable location. A friend of mine told me not to go directly East into Doctores on foot, as it's kind of dicey, so I followed his suggestion. Anywhere to North and West is fair game though.
The only real drawback to the apartment is that it's on the ground level and right on the street. The metal staircase to the complex is also right outside the front door. Between the two, it gets a little noisy from roughly 7AM on. If you're a late sleeper like me, bring some earplugs and this won't be an issue at all.
Minerva and Luis were excellent hosts. They're super sweet and very good about communication and tending to any issues that come up. There was one incident that I want to bring up. There was a freakishly heavy storm during my stay and the entire apartment flooded. There was roughly 1/2" to 1" of water throughout the unit. Luis and Minerva came across town immediately in the middle of rush hour and cleaned the entire unit. They were so quick to respond, thorough in addressing the issue, and apologetic about the incident, that I almost don't want to post about it. THE ONLY REASON why I'm bringing it up, is that had I had any valuable electronics such as a laptop on the floor, it would have been completely destroyed. Luis and Minerva assured me that this never happens, I'm only bringing it up to suggest that you keep you valuables in the closet or on a counter or whatever if you're there during a storm or rainy season.
All in all, I loved my stay here. It was a high quality AirBnb across the board and I recommend it whole-heartedly due to the combination of location, affordability, quality of the unit, character of the hosts, and safety. You can book this without hesitation.