The apartment is a bit smaller than the photos suggest, but that is really the only 'bad' thing I have to say. The place has everything you need (e.g. washer/dryer, electric stove, full bathroom, ironing board) and is very clean and modern. It's perfect for a single person, either for a short or long stay.
The area is very central and close to many different restaurants, and is only two blocks from Wan Chai MTR station and maybe 10-15 mins walk from Causeway Bay (another central area). In my experience with staying at other places in Hong Kong, getting home by taxi was never an issue with this place as Hennessy Road is one of the main thoroughfares so everyone knows where it is.
Also, Celine is a fantastic host. Very friendly and attentive, and she was always quick to answer my texts and try to accommodate my requests. Would definitely recommend this place!