I have not ever had any complaints about the separate, private master bathroom being used. I think Lisanne should have been a bit more clear.
The walls are not adjacent to the master bedroom. There is a whole 10 foot closet and vanity area between where the guests stay and is made private by sound proof insultation and two solid wood doors between the room which she mentions. The studio that I stay in has it's own toilet so the bathroom is not frequented that often for that exact reason. I cannot hear anything in the main house from that bathroom.
I leave the property often when my guests are present or I stay in the studio which is completely private.
The walkers on the trail at the reserve only see me from my house, IF, I am OUTSIDE on the west deck from approximately 250 yards distance, otherwise, visually private. The area is very open and may have that feeling that Lisanne had , at first.
Actually most guests come here because of the openness and the ability to run or walk, right out the door. Her party was not interested in that.
The weekend that Lisanne's party was here was one of the last sunny weekends of the season. There did seem to be a lot of people hiking that weekend but they don't see my property except where I mentioned. This spot is very quiet.