I was thinking about going to San Francisco during the summer. Upon my previous trip, we stayed a couple nights at Sheraton Fisherman's Wharf. However, we'd like a new approach to the city. We would like to stay somewhere around Nob Hill. If possible, we would like to stay in a hotel near the top of nob hill which would provide better views. Which hotels would offer the best unobstructed views of either downtown or even the bay. Any suggestions would be appreciated.