You could take Hong Kong Subway(https://www.travelchinaguide.com/cityguides/hongkong/transportation/subway.htm) running between these two hotels. The journey should be round 20 minutes. From the Bridal Tea House, you could take the Tsuen Wan Line from the Yau Ma Tei Station to Admiralty Station. Then, transfer to the Island Line and get off at the Fortress Hill Station. The City Garden Hotel is not far from the metro station.