Alison has two rooms and I stayed in the smaller of the two which was generously sized for one person. Lots of closet space and drawers. Nice rooftop views from three windows. Private shower room, with art deco styling, across the landing was easily accessible. For a city location, the room was extraordinarily quiet at night for 4 of my 6 nights there. The other two coincided with U.S. Superbowl weekend and there was some street noise - but this is unsurprising.
The rooms are on the second floor (US third floor). All the flights of stairs have handrails but if stairs are a problem for you, perhaps think twice.
Other than this, it is a perfect location and stay. It is my best Airbnb experience since an exceptional stay I had in 2015. Cow Hollow feels safe and is a great San Francisco neighbourhood. So thank you very much indeed.