We stayed for 3 nights at their family room. You may bring luggages directly to the 6th floor, then one member from your family/group can just use the stairs (fire exit) to go down to the 5th floor for the fast check-in procedure. Take note that they only accept cash payment for the succeeding nights of stay. Sir Ken at the reception office is very accommodating and helpful. They also sell there discounted tickets to Ocean Park, The Peak/Madame Tussauds/Tram, Ngong Ping, Macau, etc., (for adults and children)
The Golden Crown court building is just a very short walk away from the MTR TST station, and also from the A21 bus stops to/from airport or Disneyland. Fastfood that are familiar to the kids (McDonalds, KFC, Pizza Hut, etc.) are also very near, so are a number of international grocery stores.
The corridor and rooms at New Yiu Fai are nice and clean, thanks to the Filipina housekeepers. The flat and rooms inside appear to be newly renovated. There are no closets, but you could just hang clothes with hangers using the hooks provided at the back of the door. They provide a dispenser for hot and cold water, and there's also a ref for shared use. I think these are standard features for guest houses in the area, and we greatly appreciated the water dispenser, it greatly reduced our expenses for bottled water. The towels provided are of a very thin material, but they are clean and smells clean, and could serve their purpose well nonetheless. Body soap and shampoo are also provided in dispensers. Toothbrush, toothpaste, and other toiletries, you'll have to bring them yourself. Hot/cold water is available in the showers. Wifi is fast and reliable. And 3 socket adaptors are already provided with their extension power cord.
We'll definitely consider New Yiu Fai again for future trips to HK.