We spent a little over two weeks at Huia Hut and loved it. The house is very comfortable and has everything needed for a long-term stay. Despite sharing a backyard with the main house, it is extremely quiet and feels very private. The location is excellent, within easy walking distance to Wanaka city center and Iron Mountain. There's also a fantastic local grocer and coffee/food cart just a few blocks away. Wifi was generally pretty good, though my partner had to work one day and experienced a few interruptions during video calls, which required tethering to a phone. I would recommend bringing a data sim card as a backup if you're planning to do a lot of work.
Otherwise Huia Hut was pretty much perfect, and we'd love to stay here again!