Falling in love with your therapist. On transference & countertransference

Robert Rowland Smith and Mark Vernon discuss these two dynamics of projection. Transference and countertransference have become core to psychoanalysis, though Freud and others were initially very wary of them. So what are the limits to using the feelings that fill a therapy room? 

How can the set-up of the room itself affect such things? How can transference and countertransference be unethically manipulated, not least when feelings of love are activated? 

And also, how do these experiences relate to the uncanny, even so-called paranormal types of awareness and perception?