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I just got off the Infinity and stayed in concierge class cabin 9044. We were forward under the Thallassotherapy pool area. The best part was the mattress pad...extra comfortable. It was fairly quiet from above for us, but we flew home with some folks who were concierge class mid ship and they said the noise from pool deck chairs from above was rather bad, especially if one likes to nap in the afternoon. ...i would book the same forward cabin again, but watch out for the noise if you're mid ship under the pool. Aft under the buffet area....I'm not sure about.
