We are staying at your hotel both pre and post a cruise with Regent RSSC (on December 15th 2018 - one night) and (December 28th and 29th 2018 - two nights). Could we store our bags with the concierge on 30th until 17.00hrs without extra charge?

Yes they are very nice about that kind of stuff when your traveling. They lock up your bags in the secure room and you will be worry-free don't worry about having fun on your trip or anything happening to your stuff this is a very nice hotel. With all the amenities you can think of so be very happy you pick the right Hotel.

Yes you can, i stored my bags while waiting for my flight after checking out.

Yes