UK English teacher looking to rent flat/room

I am a mature responsible English teacher from the UK who has been living in Madrid for quite a few years. 
 
I am looking to rent a large room/flat (1-2 beds for a flat) share with a Double Bed in the Arganzuela area (Especially near metro Delicias, Embajadores etc.  I would also like to stress that I wish to live with non smokers in a non smoking flat. 
 
If available I would also be interested in places near metro Quevedo, Canal, Plaza Espana and Bilbao.