We enjoyed our stay at Lake Haewa - it's an excellent location about 15 mins drive from Wanaka and with so much beautiful NZ mountain scenery in all directions it's a great place to explore the area from.
We cooked at home both nights we stayed and found the house to have all the facilities we needed to make nice dinners. There aren't many nearby options for eating out but Wanaka is nearby so if you are happy to drive then this a good option (we went out for lunch to a place called Big Fig which was great).
We'd certainly stay again if in the area.