Greg is a great host who was flexible throughout the entire booking process, and I enjoyed my time at his apartment. The bed was comfortable, the area was safe and quiet, and the location in Nob Hill was mere minutes away from fabulous parks.
I very much enjoy seeing sunshine, and the only quibble I have is that I wouldn't call the apartment "bright". The skies in this part of SF are frequently clear and there are two very large windows, but they face towards the north. The result is that they get a decent amount of indirect light, but at least in the month of September I never felt any direct sun into the apartment despite being there 20+ hours per day. Stepping onto the sidewalk outside reveals a great view of the Bay Bridge and is likely to have direct sun, but it never came into the apartment.
One other tip to future travelers - this part of SF is a street grid, but because of the way the grid sits on top of hills, some routes to the apartment that are much easier on your legs than other routes. Experiment until you find something that works for you.