I have experience with this new development. The maintenance has changed a couple of times since the units entered the market, so your question, "how much is the maintenance?" is actually a difficult one to answer.
There are many new developments in Harlem, Manhattan, Brooklyn that are near public housing. It shouldn't put you off from purchasing. You need to visit the neighborhood and walk around to determine if it fits your housing needs.
Lastly, you should know the Dafina is a land-lease. It makes a difference to some buyers as it may affect re-sale or renting of the apartment in the future.
If you need more information, feel free to contact me.