This was my third stay at Abel's place, and my second long-term stay (5 weeks). I have been travelling there partly for work and partly for pleasure, and this residence definitely exceeds my needs!
The apartment is in a super location -- handy to shopping, banking, restaurants, street food, a convenience store, dry cleaner, etc. The local shopping mall is the equivalent of anything in Canada or the US, with great retail and restaurants -- though, TBH, I basically shunned it in favour of local shopping and dining, which are much more interesting.
The apartment is within walking distance of two metro stations -- although it's also very easy to catch the paseros (local buses) which come by frequently, and drop you off at the subway.
It's also within an easy walk of the historic centre of Coyoacan, which is both extremely beautiful, and full of restaurants, bars and interesting shops. Strolling around the area is a real pleasure.
I found the area completely safe. I had no qualms walking along the avenue at night; the neighbourhood is busy and full of activity. I also had no issues using local transportation, and would highly recommend it as a safe and (relatively) fast way to get around the city.
Abel's apartment is completely comfortable and well set up for long-term stays. It features a full kitchen with stove, fridge, microwave, toaster oven and coffee maker, as well as washer and dryer. The bedrooms are comfortable with good storage, and the bathrooms are pleasant and well designed.
For me, it really is a home away from home. I'm more than happy to recommend it as an excellent choice for your Mexico City stay.