We had a great stay at Dulce’s apartment.
Although the place is quite dark (2d floor) and small, it has everything you need for two persons. The real added-value comes from the outstanding rooftop! We also loved that the apartment comes with a laundry (bring your own detergent) and a free-access to the gym.
Location-wise, the place is in the middle of the historical center, surrounded by local markets and stores, and close to the main plaza and Palazio de Bellas Artes. The neighborhood is very busy during the day and felt totally safe (we were two girls).
Definitely recommend !