Lovely spacious room, well equipped and with a very comfortable bed. Note that Vivian does say there is no hob or oven if you are self catering - this isn't an issue just reinforcing the point. Vivian made us feel very welcome and gave some good tips on eating and drinking locally. Trader Sam's was a great time.
Finding the house was a bit tricky so clearer door number and bell marking would be helpful.
The address is out of town but only one bus, 38R, ride away, taking about 20-25 mins to downtown for $2.25. Note that one Muni hop on/hop off ticket seemed to last 3 or even 4 hours so it's really cheap getting around.
One word of caution if you are a late riser or early to bed: Vivian's children are full of energy and run around after 7am till 8pm. Their footsteps are loud. Take ear plugs!
Overall very happy with the local action and good value for San Francisco.