Perugia, a well-known cultural and artistic centre, is a city of 150,000 people. More than a quarter of the population are students, many from abroad, giving it a vibrant social scene. In Perugia, Kercher shared a four-bedroom ground-floor flat in a house at Via della Pergola 7 (43°06′53″N 12°23′29″E / 43. 1148°N 12. 3914°E / 43. 1148; 12. 3914 (Via della Pergola 7, Perugia)Coordinates: 43°06′53″N 12°23′29″E / 43. 1148°N 12. 3914°E / 43. 1148; 12. 3914 (Via della Pergola 7, Perugia)). Her flatmates were two Italian women in their late twenties, Filomena Romanelli and Laura Mezzetti, and a 20-year-old American student from the University of Washington, Amanda Knox, who was attending the University for Foreigners in Perugia on an exchange year. Kercher and Knox moved in on 10 and 20 September 2007, respectively, meeting each other for the first time. Kercher typically called her mother daily on a mobile phone; a second mobile phone she used was registered to her flatmate, Romanelli.