If you decide to make a visit, take the MTR and get off at Mei Foo station. It is a 10 mins walk to the Household center, 2nd Floor. Their official website gives excellent directions (step-by-step photos, and even video) and you can even pre-book and pay in advance online using Paypal. They offer 3 English tours per day so it's important to book ahead.
As a side note, if you need to use the restrooms, you need to get the key from the receptionist.
There are also "Dinner-in-the-Dark", "Silent Yum Cha", and most recently "Birthday in the Dark", "Silence le Cabaret", "Concert-in-the-Dark" , and "Love-in-the-Dark" too. We were quite bummed that our visit didn't coincide otherwise we would have definitely booked either of the first two options.