We are a family of 5 (three sons 16, 18, 22) traveling to SF in early June. I am very overwhelmed and have no idea what part of the city to stay in. We will only be there three days and probably would like to rent a apt./flat. Want to be close to public transportation, as we are not going to rent a car and will be coming from SFO. Would like to see the Golden Gate Bridge, Fisherman's Wharf and ride the trolley. Any suggestions?