It was this place, @PerfidiousAlbion. It looks so much more normal in the photos than in real life. If you look in the bottom right corner of picture 5/43 on expedia, you will see the delightful wire, flower-shaped condom holder provided in each room.
The hotel is located on a industrial estate of luxury car showrooms and the only access to rooms is via your private underground garage. Each room has it's own "special facilities," like a plunge pool or a pool table. Ours had a mahjong room (with bar), a fully equipped formal dining room and sitting room (with a selection of serious Chinese business media for the gents and magazines about kittens, puppies and bunnies for the laydeez), a sun room filled with fake rocks and paper parasols and a glass courtyard in the middle of the open plan bathroom with a 6 foot champagne flute filled with gold tinsel and a model of Big Ben. There was also a glass-sided disco hot tub for 4 and the biggest TV you have ever seen in a room with a glass wall overlooking a garden enclosed by 3 other rooms with a view straight into their bedrooms and... ahem.. of all the action...
The one facility the room didn't have was a wardrobe or anywhere to put your clothes or luggage, just 2 coat pegs...
I am not entirely sure what the google translated guest guide was offering but we did understand that there were some "special services" available and the hotel was checked daily for spy cameras but we weren't allowed to film "activities" in the rooms.
It looks like they have spruced the building up a bit since we stayed there. When we were there it looked like a cross between a B&Q warehouse and an underground car park, no signage, windowless and doorless on the outside, just a drive in entrance, no lobby, restaurant, bar or even any pedestrian access, and it was all grey concrete and fluorescent strip lighting.
www.expedia.co.uk/Shenzhen-Hotels-Six-Star-Motel-Shenzhen-Longgang.h7706856.Hotel-Information
www.tripadvisor.co.uk/Hotel_Review-g297415-d2164578-Reviews-Six_Star_Motel-Shenzhen_Guangdong.html