We haven´t met Willam, but there was for us no need for it. He arranged everything and the apartement was perfect for us and also perfectly located for us. not in the very city center ,so it was more quiet. the national archeological museum was close by and if we didn´t want to walk we took a taxi, which is cheap. the surrounding of the apartement is special and because of not so many tourists at this time of the year it seemed to meet only greek people. I liked Athens very much and the original surrounding of the apartement!