With three independent adults living under one roof, giving each private space was key to domestic harmony. Happily, for the Charles household, all needs could be accommodated comfortably in their 2,800 sq ft (260 square metre) flat in Hong Kong’s Mid-Levels, chosen for its sweeping city and mountain views, and the seclusion afforded by a semi-private access road. It was up to interior design studio hoo founder YC Chen and senior designer Yannes Cheng to make the three-bedroom flat work. Richard...