Accomodation and living in HK

Hi

I am new here and am in the midst of planning my move to HK in about 2 months time.
Appreciate if I could get some help with some questions.
1. Hillsborough Court -anyone familiar in this area. Is public transport an issue to get to central or is walking to central a viable option for work? Am thinking if the weather is conducive to walk and generally quite safe?

2.  I noticed some accomodations which are rooftop accomodations - are there any concerns when renting rooftops.

3. For about 13-5K HKD, if i wanted somewhere at least 400-500 sq ft. Clean and comfortable, where would be a good option to look for with great access to MTR or walking distance to Central. I am working in Central. Besides monthly rental and utilities - i noticed some govt/maintainence tax. Anything else that are generally included into the rental and what are usually not included?

4. I am quite curious seeing that public transportation is supposed to be fantastic in HK - what's generally a common distance for HK people to walk. I'm from Malaysia btw and walking anything beyond 1KM in this weather can be quite a killer.

thanks and appreciate the help

regards
Looking forward to Hong Kong!