Bunk with Bill, welcoming quiet place to sleep (8)

'place to sleep' is the definition.
I can't tell whether this defines the answer.

'bunk with bill welcoming quiet' is the wordplay.
'bunk' becomes 'crap' (synonyms).
'with' says to put letters next to each other.
'bill' becomes 'ad' (advertisement stuck on wall).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'crap'+'ad'='crapad'
'crapad' going around 'sh' is 'CRASHPAD'.

Can you help me to learn more?