be in apple-pie order
US /bi ɪn ˈæp.əl.paɪ ˈɔːr.dər/
UK /bi ɪn ˈæp.əl.paɪ ˈɔːr.dər/

1.
in perfetto ordine, impeccabile
to be perfectly neat, tidy, and organized
:
•
After she cleaned the house, everything was in apple-pie order.
Dopo che ebbe pulito la casa, tutto era in perfetto ordine.
•
The manager likes to keep his office in apple-pie order.
Il manager ama tenere il suo ufficio in perfetto ordine.