I definitely recommend you to stay in Greg's place, especially for those who plan to stay longer and closer to the universities e.g. the EduHK and CUHK.
The room is clean and odorless. No bugs or mosquitoes (unless you open the windows all day long). Cooking equipment and home appliances are awesome. Clean and fully function.
The host himself was very helpful and kind. He's willing to help you especially to get directions or recommendation for hiking and sightseeing. :D