Not sure this should be a review. Booking made, SP did not let the punter down, he took a dislike to her curtains from outside the property and bailed.
I'd suggest the fact that he heard several voices inside the house was more significant than the curtains.
Either way, I've walked and/or cancelled a couple of times because of the general area or property itself looked grim. For me, general safely, car parking, discretion from neighbours, and so on are all valid considerations when rating a punt.