I left Buenos Aires from Retiro at about 22:30, and arrived in Cordoba at 7:00. I paid 80+ pesos for coche/cama on Chevalier, and it was very comfortable. From the bus station, I shared a 4 peso cab to San Martin 338 entre Lima y Catamarca where Baluch Backpackers Hostel is located. I made a reservation before leaving BsAs.