If you are looking for a green suburb try Talawatugoda, Pelawatta or Battaramulla. They adjoin the Diyawanna Oya, a scenic man made lake. and are in the administrative capital of Sri Jawardenapura. read more
Good Neighborhoods can be : Colombo 7, Kollupitya, Bambalapitya where newly apartments are, Hawlock , Kirulapana, Mount, Duplication Road area, Kalubowila, Pitakotte, Mount Lavinia. Bad Neighborhoods : Dematagoda, wanawalasala, Maradana, Wellawaththa, Colombo o1, Slave Island ( Kompannavidiya). read more