Wanchai is definitely one of the most convenient spots in Hong Kong to get around. Shanshan's place is located right in the middle of Wanchai and so convenient to get to a lot of places. 5 minutes walk to the MTR station, 5 minutes walk to the tram station, and even within walking distance to Admiralty. We loved the location a lot, even though it could be a little noisy in the evening. But the noise is not that disturbing if the windows are kept closed. The apartment itself is quite cozy, well equipped, and nicely organized. The toilet is a little small, but that's the average of the HK style living, which we were fine with as well.
Shanshan is very responsive on every note I wrote her, always being prompt and precise. We didn't get to meet her in person, but can absolutely feel her hospitality. We'll return for our next trips to HK and it is recommended to other travelers too.