I was traveling solo. I met a few people on board who were traveling solo too - nobody was surprised. Overall the cruise was very good, but the things can't be perfect...
Organization - all was working like a clock: embarkation, checking-in, schedules, etc.
Cabin - no faults. There was no vibration or other noises. Interior was showing some wear and tear, but everything was spotless. I saw the cabin attendant scrubbing already clean surfaces a few times.
6562 - all was fine, clean and quiet.