Do you have luggage storage service and how much does it cost per day?

If they store the luggage, if you arrive before the delivery of the room or if the flight is after check out.

They keep your luggage for a reasonable time at no cost, in what they give you or if the room has expired

Yes, I left my luggage for 3 hours and at no cost. They give you a receipt and hand it in when you pick it up.