I share my apartment with a flatmate and we have a 60 sq. metres apartment with a huge living room and open kitchen space. Best is probably the view from the 15th floor over harbour of Hong Kong, my room also has a view and a big bed. Apartment is 15 minutes walk from Soho, 2 minutes from SYP metro station which connects to Island line and you are in Central in 10 minutes!
No smoking in the apartment. Thats basically the only rule besides common sense.