We loved our stay in Mount Manganui, Rosemary and her family were welcoming hosts. It was a great location for accessing the local town, walking distance from the beach and local amenities (and the cricket ground which is why we were in town).
The space is nice, very comfy bed, and spacious and modern bathroom.
As others have eluded to, you are in the ground floor of the family home so you do hear noises from upstairs from time to time. If you are particularly sensitive to that / a light sleeper just be aware.
Overall we loved our stay and would stay again.