How much would one more night cost?
'Costerebbe' — stress the second syllable: 'cos-te-REB-be'. Conditional of 'costare'.
Use to check the price before agreeing to the extension. The nightly rate for an extension may differ from your original booking rate.
'Costerebbe' is the conditional of 'costare' (to cost), making the question hypothetical and polite. 'Una notte in più' = 'one more night'. The conditional is used because the cost depends on availability and hotel policy.
Mantenete lo stesso prezzo della mia prenotazione originale?
Do you maintain the same price as my original booking?
Asks if the original rate is honoured
C'è lo stesso prezzo o cambia?
Is it the same price or does it change?
Simple yes/no question about rate consistency
Mi fate una tariffa speciale se resto altri tre giorni?
Can you give me a special rate if I stay three more days?
Negotiates directly for a longer-stay discount
Italian hotels often honour the original booking rate for extensions, especially for returning or loyal guests. This is not guaranteed but is common practice. Always ask, as the rate could also be lower (if high season has passed) or higher (if last-minute demand has increased).