The address appears in the 1894 Jurors List, and Annelise has found several references to it:
1. There is a listing as early as 1885 for Mrs. B and Miss Shepherd, "Harperville"
2. 1905 Jurors lists shows
"Knox, Lefferts .. China Mutual Insurance, Harperville, Robinson Road
3. In 1914, his [Noel Croucher] address was 9 Garden Road, known either as Harperville or Harper's Villa, owned by Li Tsze- chiu and managed by J.H. Seth. this too apears to have been a boarding house or bachelor's mess. [or "private hotel" perhaps - Annelise]
The quest of Noel Croucher: Hong Kong's quiet philanthropist By Vaudine England
4. The 1919 Ladies Directory shows the Misses Graca at Harperville, 9 Garden Road
I'm not sure of the location, so I haven't put a marker on the map. I'm guessing it may have been one of the buildings up the slope and across the road from The Albany.