We chose it because we wanted to see the towns and cities on this particular Danube cruise. We had never done any kind of cruise before, and didn't really know what to expect. We found the cabin comfortable and spacious and the staff were excellent. The food was much better and more varied than we had imagined it would be, and the choice of wines were very good. The only downside was that the low levels of the Danube meant that halfway through our cruise, we had to pack up and be bussed upstream from the Emerald Sky to the Emerald Dawn, but it was handled with the minimum of fuss and we didn't miss a day's sightseeing. The Dawn was a more recent boat, and the cabins in the Sky not quite so well designed, but at least we were able to continue our cruise by transferring.
The highlight of our trip was visiting Vienna and attending a concert there in the evening. The music was wonderful. It lead us to wonder why the same music (Strauss, Mozart etc) was never played on the boat itself while cruising down the Danube! Our only real complaint would be that in the evening, the music was often too modern and too loud and there was nowhere else to go to sit and talk to our friends.
Our first cabin on the Dawn was wonderful - masses of storage and a very good shower room with a drawer under the sink and a great shower. The cabin on the Sky was rather disappointing by comparison, as the bed was far too close to the shower room and the hanging space was much smaller as the safe was inside the cupboard. There was no dressing table either, and the hairdryer was underpowered compared with the first one.