This is a great place. Very close to McArthur Bart, which takes you to Embarcadero (and the lovely Ferry Building market) in less than 20 mins. Door to door, you could be in Mission in about 40 mins. We went to the City most days.
There's also lots going on around Tawnya's place - even though the street is very quiet, it's 5 minutes walk to a great pizza and beer garden and 10 minutes to the many restaurants and shops of Telegraph Avenue. We explored Temescal, Rockridge and even Piedmont by foot from the Air B&B (although that IS a lot of walking!). It's also really convenient for visiting Berkeley, as we did.
As for the place itself, having all that space was great - there was plenty of room to hang our clothes in what is essentially a dressing room off the bathroom, the kitchen is large and very separate from the bed. It barely feels like a studio at all. Bed was comfy and the large TV had Netflix, which was much appreciated. When we ran into Tawnya she was super friendly and helpful and she also left an iron and ironing board in the studio for us, at my request, which was great. We were able to cook in well-equipped kitchen and really appreciated being left milk and cereal, tea and coffee. I would highly recommend - great base to explore San Francisco and the Bay Area.