My husband and I rented the studio for four weeks and have only good things to say about our experience there.
The interior of the studio is every bit as lovely (and clean!) as it looks in the photos, with ample, comfy seating; a very comfortable bed; a small, but well-thought out user-friendly kitchen area; and a great shower. There was also plentiful storage space so we could completely unpack.
The outdoor space was terrific, too. The studio is separate from the house, and you enter the backyard through a locked gate. Though the yard is shared with Cluny and her family, they rarely used the yard, so often it felt like an extra room (e.g., for one of us to have morning coffee, while the other slept in).
The location is terrific and totally walkable -- the immediate Rockridge neighborhood has no shortage of shops and restaurants (ditto for the Temescal neighborhood, a slightly longer walk), and it's a straight shot into San Francisco on the yellow line (which also goes to SFO) from the Rockridge BART station just a few blocks away. (But if you do come with a car, you are able to park in the driveway, which is a big plus since all-day street parking is not allowed without a resident's permit.)
Our hosts were warm and welcoming, and responsive when we needed anything or had questions. Cluny communicated with us ahead of our arrival and had lots of helpful hints about the neighborhood, favorite haunts, etc. It is not an exaggeration to say that we had a perfect stay, from start to finish.