When you want to taste real local food in Hong Kong, a place is extremely well known among locals and I highly recommend this place to you! Hope you can grab a seat there because the chances are Lan Fong Yuen is always packed every single day! It is one of the oldest tea restaurant same as Mido Cafe at Temple Street in Yau Ma Tei (Hemp Rope Habour, it was a place for docking ships but reclamation changed the landscape) in Hong Kong.
They are one of the representations of tea restaurant. Lan Fong Yuen is located at 2 Gage Street, Mid-levels. Another local food place may interest you. I do not go there personally and I do not recommend. It is Ngau Chi Wan Village. The very first comes to my mind is dirty. The thing is that a popular place for snapshots among locals nearby, which is Choi Hung Estate (Rainbow Estate).