These are nice places:
Makati CBD, Ortigas, Eastwood and Global City

Makati CBD-if you'll be working within it, stay there.
Ortigas City - almost like Makati CBD, but more of Language schools. So if you are in the LAnguage industry (teaching English), this is the right place for you.
Eastwood and Global City - if you love entertainment, these are the places for you.