I recommend he lower his expectations and look outside MT Eden, were the average price is 2m.
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Chances are slim of buying a house.
Look for a unit with a small patch of land.
Look at greater Auckland.
Look for a townhouse that's different.
Look for something close to cafés or town.
Look for these as close to public transport as possible.
You asked what a 1 bedroom in MT Eden would cost in 10 years...3 to 4 million.
Buy something rundown, try avoid new unless it's in a premium position however these may already be priced into the sale price.
Your first home should not be your last, a good small property with capital growth will have you on your next property in 24/48months so long as you knuckle down and hammer as much of that mortgage as possible.