Kifisia, plot of land 304 sq.m., with a building factor of 0.6 and a coverage factor of 0.4, with a detKifissia or Kifisia (also Kephisia or Cephissia; Greek: Κηφισιά, pronounced [cifiˈsça]) is a municipality and one of the most affluent northern suburbs in the Athens agglomeration, Attica, Greece, mainly accessed via Kifissias Avenue, running all the way from central Athens up to Theseos Avenue in the suburb of Nea Erythraia. It has traditionally been home to rich Greek families and major Greek political families.ached house of 157 sq.m., built in 1997, in a very good and quiet location, in an area with detached houses, near the National Highway and central arteries. Close to schools, market, transport.