Hotel Posada del Centrovs?

"Pleasant rooms around a tiled courtyard, most with shared bath and some with private bath; a good deal, although front rooms face a heavily trafficked street."

"Set in the heart of Oaxaca, a short walk from many highlights, the budget Hotel Posada del Centro, offers 22 basic but clean and vibrant rooms with private or share bathrooms -- and dirt-cheap rates." Full review