My pregnant wife and I and our two year old daughter stayed with Bonnie for a week in January. From the moment we arrived Bonnie greeted us with a big hug and made us feel at home. The space is very peaceful and relaxing. The house and bedroom was more than big enough and is kept very clean and tidy. Lots of toys and instruments for our two year old daughter to play with. The garden out front has some great herbs and fruits and the shared kitchen has everything you would need for cooking meals at home. We cooked dinner at home at least 4 times throughout our stay. The guest bathroom is also quite nice with a fancy bathtub which our daughter enjoyed.
Bonnie was a great help, answering any questions we had and helping out with the laundry whenever we needed it, a huge help and much appreciated. Bonnie is a former midwife and has all the equipment so she also offered to let us hear our baby's heartbeat which was a treat.
Haiku is a great little authentic town with a few decent dining options. After seeing the rest of the island we would definitely want to come back and stay in Haiku.
We stayed in the guest bedroom in the main house. As far as we could see the only potential drawback is the room doesn't get direct sun in the morning and the house location is located on (relatively) busy Kokomo Road. Convenient for walking into town but you can hear the cars on the road at night and we had to keep a close eye on our daughter in the garden to make sure she didn't dash into the road. I imagine the other bungalow in the backyard is even more secluded.
All in all we had a great stay and hope to see Bonnie again next time we are on Maui.