The Peninsula is the place in Kowloon side. The air near the water is much better, because frankly the air in HK is absolute shit.
Shangri-La Kowloon has a great dinner/lunch buffet.
Grand Hyatt on HK side is OK.
Personally, I'd recommand to stay in Tsim Tsa Tsui and take a taxi to HK side if you need some entertainment.
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