Update on this one...new growth is growing vigorously, and the new roots seems to be well established.
The new growth shows signs of anthocyanin reaction to light, which I believe it's normal since the flowers of this variety are red/purple.
Growing conditions:
south window with 5 hrs of filtered sun (approx. 25% shade)
Waterings every two days and mist by night time with a cool mist humidifier.
Temps: between 24 and 19ºC
Fertilizer: approx. 50% of the recommended dosage (Akerne's Rain Mix).
Basically I'm giving it the same conditions as my other catts, except for the cool mist.