Cosmo at Tai Kok Tsui Rd. Walk to nearest Olympia station takes about 10 - 15mins. But they have free shuttle bus quite frequent bring to few locations namely langham (you can take MTR Mongkok here), or another 1 dono wad terminal (here can walk to Symphony of lights) and another location. You can see their facebook, quite good review. Staff are friendly too..and right opposite McD with many other shops and eateries