I loved this place. It's spacious, and the furniture is comfy and delightfully arranged. Union Square is just a short 10-minute walk away, so staying here means that you're really close to all kinds of activity, but it's also just secluded enough that it's relatively quiet during the day and at night.
There is a hospital with an emergency room just a few blocks away, which is a great positive for just-in-case, but if you're a light sleeper (like I am), then you might be disturbed by ambulance sirens occasionally at night.
Overall, I loved staying at Peter's place, and I hope to stay there again the next time I visit San Francisco.