San francisco hotel with rooftop pool in soma district union square 15 minutes featuring mid century modern design best western plus americania is in san franciscos soma district a 15 minute walk from union square shopping and people watching its a 3 minute walk to hop a vintage streetcar on market street to the embarcaderos waterfront attractions asian art and culture the asian art museum an 8 minute walk is one of the largest museums of its kind in the western world and the museum