Is there a left luggage facility at the station?
de-PO-si-to — stress on second syllable. Ba-GA-gli — stress on second syllable, 'gli' like 'll' in million.
Ask this when you arrive at a city before your accommodation is ready and need to store your luggage for several hours.
C'è (is there) + noun — the standard availability question. Deposito bagagli (left luggage / luggage storage) is the official term. In stazione (at the station) — in is used with stazione without an article in fixed expressions.
Quanto costa per valigia?
How much does it cost per suitcase?
Per valigia (per suitcase) — rates are usually charged per bag
Per quante ore posso lasciare la valigia?
For how many hours can I leave the suitcase?
Checks the maximum storage duration
C'è un armadietto automatico?
Is there an automatic locker?
Armadietto automatico — self-service coin/card lockers, common in large stations
Rome Termini and Milan Centrale both have large staffed luggage storage areas — very useful given that Italian hotel check-in is typically at 14:00 and check-out at 11:00.