Stayed at a  hotel last week, it was charming, newly designed in its interior, lovely atmosphere. If it wasn´t for one important problem. The lighting switch. After a transportation by train, by another train, by flight and by another train and at last by a metro.  At last, walking to the hotel, at night, tired, taking the tiny elevator up, wanting only to get into bed, I could not find this important lihgting switch. Poking around for some while, decided to take the elevator back down to the reception asking for help to find this switch. They cordially showed me. It was hidden down somewhere, at foot level, as not to disturb the design impression. It was  a touch switch, when found, very easy to use. But impossible to find, in a black dark room. Usability is about products easy to use, sure, though they  must also be logically and visually placed, right??