Refurbished Millennium questions

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Cruising Alaska 2020. Have been on Silhouette and Equinox not Millennium. Concierge cabin deck 8- do the showers have curtains or doors. Are the pools heated and are the pool towels readily available or do you need to sign them out? We are 3 in our cabin - can we get a third chair on the balcony and are there 3 bathrobes  supplied? When they refurbished were there storage room and outlets added or was it mainly soft furnishings upgraded? Thanks