Could you recommend a restaurant?
Stress 'con-si-GLIAR-mi' — the GL is a soft palatal sound, like the 'lli' in 'million'.
Use this when asking the hotel concierge for a dining recommendation. It is polite and appropriately formal for a hotel setting.
'Potrebbe' is the conditional of 'potere' (can/could), used here as a polite request. 'Consigliarmi' is the infinitive 'consigliare' (to recommend) with the indirect object pronoun 'mi' (to me) attached. Italian hospitality culture expects concierges to have strong local restaurant knowledge.
Mi può consigliare un ristorante?
Can you recommend a restaurant?
Slightly less formal, uses present tense 'può'
Potrebbe consigliarmi un ristorante tipico?
Could you recommend a traditional restaurant?
Adds 'tipico' to request local cuisine
Ha qualche consiglio per i ristoranti?
Do you have any restaurant recommendations?
More open-ended phrasing
Italian concierges take great pride in local restaurant recommendations. They often have personal relationships with nearby restaurants and may call ahead to reserve a table for you without being asked.