Margaret's place is a really good size and is quite close to the town, though it's not quite in the area highlighted in the listing. While we heard other people outside at times and going in on the side door to the floor above us it was never intrusive.
The place was quite clean and had all the usual creature comforts one would expect. Milk, bread, instant coffee and tea, etc were nice touches as well. We didn't use the advertised garden, which appears to be shared and not entirely private, but it looked fine.
The helper was polite and accommodating for us even though there was a little difficulty with communication. Similarly, Margaret tried to answer any questions we had although as she was in a much different time zone so communication (understandably) wasn't always swift.
We felt we, as guests, could have benefitted from a welcome binder or info area about the place and area, similar to what many other Airbnb hosts provide. In it could be the house rules, Wifi username/password and other key info about the place and some maps of the area, recommendations of what to do, where to dine, etc.
As well, we understand that this is the host's home that she spends part of the year in, but there are a lot of personal family photos around the place which could be maybe replaced with more generic decorations when the host isn't home.
Lastly, although the size and location are decent, it is probably a little bit pricey, but with so few options available (hotels or other Airbnbs) in Sai Kung supply and demand factors in, I guess.