This is the best location if you really want to see Hongkong in full. The Bus A21 moving from the airport will drop you right in front of the Comfort building where Altas is ( the stop is Cameron Road Stop No. 13). The fare of the bus in HKD 33 one way from Airport to Cameron Road. The MTR station ( Tsim Sha Shui) is hardly fifty steps from Comfort Building. You can buy an Octopus Card for HKD 150 having HKD 100 credit. This can be used at MTR , Ferry's, buses and even to purchase stuff at stores. This card can always be topped up. Octopus card can be bought from any convenience store or MTR stations. Ferry rides are cheaper as compared to MTR. On your way back home you can return the Octopus card at any MTR station and can reclaim your HKD 50 + any remaining balance.
For Muslim travelers, you can easily get halal food from Chungking Mansion which is about 0.5 KM from Comfort Building. Meal for one person for one time will cost you around HKD 40 - 50.As you move out of the building start moving towards your left to reach Chungking mansions. The grand mosque is right in front of the comfort building .Star Ferry pier is about 10-15 mins walk from Comfort Building.
There is a lot of shopping around this hotel.
Suraj ( the host) is a nice guy and very helpful. He can plan your day out and also guide on what to see in Hongkong.