I'm an actual local native Maori ... or to be more precise part-Maori, given there are no true blooded Maori left. However I was pretty much raised as middle-class white guy, and given my skin tone usually just get mistaken for a normal pakeha with a tan.

First off I didn't think we had any specific "Maori neighbourhoods". It is sadly true that Maori (and other pacific islanders living in NZ) have a higher percentage of lower income families, and criminal offenders. We do have lower income neighbour hoods, and they often have a high percentage of Maori and Pacific Islanders.
That being said there are are no places in New Zealand that I wouldn't feel safe walking down the street. There are however places I wouldn't go walking through the parks at night, or taking short cuts down alleys. I'm sure that's pretty much sadly true of any nation.

While Maori do have a higher percentage of low income families and criminal offenders, we do cover all walks of life, and have a spread throughout society otherwise. Except posibily politically, Maori aren't held apart as an indigineous race. According to our last census, approximately 25% of our population identify themselves as Maori, which makes it pretty hard to make any exclusions. In reverse it's also fairly hard to anything that is also specifically for the Maori alone.
You will find however that there are attempts to allow for Maori culture and practices in what otherwise would be normal western services, which often appears to outsiders (as well as many non-Maori locals) as special exceptions for the Maori. I would advise when you do run into these that you take a closer look, because often the services are actually the same, and secondly none of these (that I'm aware of) are actually for just Maori and anyone can actually use them, they just cater to Maori cultural sensitivities.
It's also of interest that while English is our predominant language, Maori is also an official language and can be spoken in any formal situation with full equal rights. However given not even 50% of us who identify as Maori can speak the language (I'm ashamed to be one of these, despite 3 years of taking it during school), this doesn't happen often, and also usually requires a translator for the non-Maori speakers.

In regards to the family violence, it seems to be an issue across New Zealand as a whole not just specifically Maori. From a my personal local view we seem to have equal numbers of issues for this for Maori/Pacific Islander and non. However that does imply a higher percentage for Maori.