Le Jardin Club is a bit of an enigma. Its name evokes something perhaps a bit more, shall we say, upscale (i.e. with actual walls and windows)? Le Jardin Club is actually a hole-in-the-wall, but comfortable and sporting quite a bit of character. It's also quite hard to find. The easiest approach is made by walking up D'Aguilar Street, turning right into Wing Wah Lane (i.e. directly away from Lan Kwai Fong), then following the lane around the corner until you reach some stairs. Climb them, and you'll be set.
Its details are:
1/F 10 Wing Wah Lane
Tel 2526 2717