My experience in row 6 on 788 was not of a quiet nature because there was a infant in the first Y bulkhead bassinet--I think that would be row 8 or 9.
Crying infants can have different reactions from us all, you know your comfort level best, so proceed as warned.
Other than that I don't particularly like being so close to the lavatories so I tend to choose seats somewhere in middle of pack, both in J and Y.
Another compliant for mini-cabin is that meal options aren't so much an option by the time they reach those last few rows.
Can't recall any other observations from my flights in J mini-cabin.
Cheers