Green’s Dictionary of Slang

anywhere one can sleep, a ‘dosshouse’, a hotel; one’s bed.

1922		Joyce Ulysses 165: ...By God, he had the little kipper down in the county Carlow he was telling me...
1940		D. Maurer Big Con 148: I’m going back to the kipper.
1989		in G. Tremlett Little Legs 195: kipper hostel or boarding house.