A great trendy and hip hotel!
While in SF on April. 2012, my 2 friends and I attended a function held on the terrace. It was very nice and kept it at the front of my mind for a future stay. 
That stay came at the beginning of Aug.2012. And it did not disappoint! :) 
The same 2 friends and I enjoyed our stay. The room was lovely and had a view of the bay and bridge. The bed was comfortable and there was ample space in the room and bathroom. We visited the bar and snacked on breaded chicken bites and some beer. The bartender was cool and was of great help. If you want internet access, they do charge a fee to access in your room but you can get some free Wi-Fi in the lobby downstairs. 
Everyone from the bell hops to the front desk clerks were very nice and professional. They greeted us w/a cordial and friendly attitude. 
There are restaurants and stores within walking distance. 
We will DEFINITELY come back to the W Hotel. It was great!! :D