The room service food was cold.
room service — pronounced approximately as in English.
Report this politely but promptly — cold food from room service is a valid complaint that should result in a replacement or refund.
'Era freddo' = was cold (imperfetto of 'essere'). 'Il cibo' = the food. Room service food arriving cold is a service failure. Italian hotels should offer to replace the food or credit the amount. Using the imperfetto here ('era') is natural for describing a past state.
Ci vuole troppo tempo per il room service.
Room service takes too long.
Report long wait times — standards vary by hotel
Il mio ordine era sbagliato.
My order was wrong.
Report incorrect orders immediately
Posso avere un rimborso per il piatto freddo?
Can I have a refund for the cold dish?
A reasonable compensation request
Room service in Italian hotels is a premium service that typically costs 15–20% more than the same dish in the hotel restaurant. When you pay a premium, the food should arrive hot and correct. A polite complaint will almost always result in a replacement at no charge.