how do i reach beijing shatan hotel No.28, Shatanhou Street, Dongcheng District from airport?

Do you mean 00:05 during the midnight by '12:05 morning'? If so, at that time, you can take the airport shuttle bus line 2 to Dongzhimen and then take a cab to the hotel. If you take a taxi directly to the hotel from the airport, the taxi cost is about CNY100-120.