Shinteresa,
I will choose Philippina. Most of them love kids but they are normally quite stubborn. I work with some philipinas (office)for more than 10 years and most of them are friendy and simple (of-course, some are very troublesome).
If for me I will choose the one Married or even single mother (they need money to support their family). Single, I don't want - might have risk to have boyfriend here in HK.
Age - 26 or above La!
The agency I choose is in Laguna city at Lam tin, Ok la! The boss their go to interview maid herself from phil (some of the agency just get file from Phil) and she choose the right person for me.
Of course, If you want to have a good maid, it is really depends on your luck and how you treat her.
Hope you can find a good one!