Can you bring me some clean towels?
a-sciU-ga-MA-ni — five syllables, stress on the fourth.
Call housekeeping or reception when you need fresh towels. Standard hotels replenish daily; budget hotels may do so every two days.
'Potete portarmi' = can you bring me (plural formal). 'Degli asciugamani' uses the partitive 'degli' (some) before a masculine plural noun. 'Puliti' = clean (masculine plural agreeing with 'asciugamani').
Posso avere degli asciugamani extra?
Can I have some extra towels?
For additional towels beyond the daily allocation
Quando vengono cambiate le lenzuola?
When are the sheets changed?
Ask about the sheet change schedule for your stay length
Manca un asciugamano bagno.
A bath towel is missing.
Use 'manca' (is missing) for anything absent from the room
Many Italian hotels now follow 'green' policies where towels are changed every two or three days rather than daily. A card in the bathroom typically explains: 'Se vuole asciugamani nuovi, lasciali sul pavimento. Se vuoi usarli ancora, appendili' (If you want new towels, leave them on the floor; to reuse, hang them up).