Looks like an A330-300 will be operating this as everyone above has said.
Row 4 of course on the -300 has one row between it and the galley as opposed to the -200 series where row 4 is the first row after the galley.
Row 4 seems to be good row for the -300, as you are far away from the toilets at the front of the a/c, however the Business Bar is adjacent to the galley, so people will be going up and down regardless of what row you sit in. Plus, noise-cancelling headsets will help drown out any galley noise!
Shouldn't be too worried about the a/c getting subbed for a -200 series, but you never know.
I hope you enjoy your trip!
Cheers.