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' means one lot of letters go next to another.
'bill' becomes 'ad' (advertisement stuck on wall).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'quiet' becomes 'sh' ('sh' is used to tell someone to be quiet).
'crap'+'ad'='crapad'
'crapad' placed around 'sh' is 'CRASHPAD'.

Can you help me to learn more?