Ive rented this apartment several times during the past decade. The apartment itself is fine... spacious, and reasonably furnished. The location is perfect. It is within easy walking distance of the zocalo and several excellent restaurants.
The patio and garden are not much to look at, but there is a beautiful view of Popo from the roof, which is a great place to hang out in the mornings.
Over all of these years, I have never actual met the owner, Sergio, but Ive talked to him often and hes been very helpful. I recommend without reservation.