Sally's house is ideal for a family. It is spacious and has all the things you would need in the kitchen, backyard, and bathroom. Initially we booked three nights, but the kids wished to stay more so we ended up staying two more nights. The kids' favorite area was the backyard and the trampoline.
The only issue was the cleanness, in particular the kitchen area. We had to clean it up by ourselves before using the dining table, cookware, utensils, and the fridge. The freezer was full of items and we didn't even bother to open it again. The BBQ was unusable. Other areas such as bedrooms and beds were clean and tidy.
We didn't visit Manly beach, but we could see it from the kitchen. The view was great.
Overall, Sally's house would be a great choice for the families who would like to stay comfortably close to the main attractions in Sydney.