We had 6302 (same cabin on the starboard side) on the Silhouette once and really liked it. If I recall, the balcony was a bit larger than a regular one. The only thing I'm cautious of when choosing a cabin on deck 6 is the smoking area on deck 5. I think you should be OK though, seeing as you're right above Blu, but maybe someone else could comment on that.
Edited to add: the smoking is on deck 5 port side only (which is why we choose starboard).