We stayed three nights with Donna and Mike in their Doubtful Suite and absolutely enjoyed it!
Donna and Mike are the kindest people and they put a lot of thought into making their rooms a perfect place to stay for their guests. We particularly enjoyed the big veranda and beautiful views of the mountains from our room. Donna was always around and offering help with anything we needed.
The room was perfectly clean and we really appreciated the heating blankets on the bed during those cold Te Anau nights. During winter, the bathroom might get a bit too cold, but it was still fine for us. The big kitchen and living room offers plenty of space to cook and a washing machine.
I would highly recommend staying with Donna and Mike instead of at one of the (seemingly quite old) motels in town!