Can I see the room first?
VE-de-re — three syllables, stress on the first.
At smaller or family-run hotels (pensioni or B&Bs), it is sometimes acceptable to ask to see the room before committing. Less common at large chain hotels.
'Prima' here means 'first' or 'beforehand', not 'early'. 'Posso vedere' (can I see) is a polite request. Asking to see the room is more common in Southern Italy and at smaller establishments — it shows you are an informed traveller.
Ha qualcosa di più grande?
Do you have something larger?
Ask if the first room shown is too small for your needs
Ha una camera con più luce?
Do you have a room with more light?
Rooms on lower floors or courtyard-facing can be very dark
Va bene, prendo questa camera.
That is fine, I will take this room.
What to say once you have decided to accept the room
At smaller Italian B&Bs and pensioni, asking to see the room ('Posso vedere la camera?') before checking in is a completely normal and accepted practice. The owner will typically be happy to show it to you.