Go to Nathan Road in Mong Kok to buy jewelry; Cosmetics will go to Tsim Sha Tsui, the gathering place of cosmetics shops at the intersection of "Granville Road" and "Canard Road"; I have a look. These places of yours are frequented by mainland tourists. Just live along the subway. Causeway Bay is a little far away, so you can choose economical hotels near Yau Ma Tei and Mong Kok. The hotels here are all very small, so you should be psychologically prepared. The Longhui Hotel recommended below can be considered, and the teahouse can also be considered. Just go to the "Where to Go" website and choose a hotel along the subway.