San Francisco has one of the world's great libraries, e.g. see these photos: http://www.pinterest.com/stellacarruth/san-francisco-public-...

Did you complain to a librarian about the restrooms? That is a cleaning issue, same as a busy airport. The library belongs to all local residents, chip in and help make it the space where you would like to linger. Bathrooms can be cleaned. The rest of the building and books are wonderful.