I had a haircut with Nina about a month ago, and she was great. She came to my house, and is super friendly. She made sure that I got the exact cut I wanted, and I'm very pleased with the results. She charged 80 pesos for a woman's cut, which was totally reasonable. I would definitely recommend her. I believe she also does color, but you need to go over exactly what you want beforehand, since she would need to bring all the supplies to your house.
I haven't been to Ryan yet, but several of my friends have and they all received great hair cuts, and were very satisfied. He's *slightly* more expensive, but I think some of the threads here saying he is "pricey" are a bit exaggerated.
Anyway, I think either of them is a good choice!