Wow, the house is huge. You definitely need at least a day to explore and enjoy everything that the house has to offer. Unfortunately we didn't plan that way but we were still able to enjoy the foostable and table-tennis. My son wants me to buy a foostable for our home now. We will plan another trip to enjoy the hot tub and sauna :)
It was rainy and really foggy during the days we were staying which gave the really nice and cozy hill-stay experience. There are nice shops, cafe and restaurants nearby. The botanical garden is at a walking distance from home and a great place to do your morning walk.
The only recommendation we will give to guests is if they are arriving on long weekends (or late evening), ensure you carry some cooking supplies (milk, bread etc.) as most of the nearby shops are closed. Those that are open have long queues and waiting time. There is a small IGA nearby (about 4mins drive) but I think it closes by 7pm.
We will highly recommend the place to anyone planning to stay in Dandenong Ranges.