"Here was the only house/Where I've lain at night/in the absolute darkness/of a box bed, listening to/ crickets being friendly"
Enjambment - and the continuation of thought and speech through the entire stanza conveys a sense of comfort that MacCaig feels when he is with Aunt Julia, sleeping at her house.
Setting - the whole verse evokes the remoteness in time and place of the setting. The expression 'only house' suggests that his aunt's house was unique, and that he felt completely safe there, while 'absolute darkness' is the physical, but temporary, darkness of a place with no street lights, and 'box bed' - an old-fashioned bed boxed into the living room - suggests the lack of modern comfortable furniture.
Anthropomorphism - (ascribing human characteristics to animals) - 'crickets being friendly' - suggests that it is the speaker who is happy, enjoying the closeness with nature.