I stayed at Marlene's place for about a month, and I enjoyed my time there.
A few noteworthy mentions:
- There is an Oxxo on the same block as the building, so getting quick snacks, groceries, and water is very easy
- The building is just a few walks away from major attractions in the Historic Center of Mexico City, so there are a lot of things available to do within walking distance
- The apartment has enough to accommodate short-stays as well as quick meals (ramen, sandwiches, etc), but I wouldn't recommend it for months-long stays
Overall it was a great experience, so if you're spending a few days in Mexico City and want easy access to many attractions, a safe neighborhood, and clean apartment/building, I highly recommend Marlene's place.