Swimming teacher at Calypso?

Hello,
Our swimming teacher is retiring. My two sons (aged six and three) are keen to continue swimming. They have been in 'bebe nageurs' since birth and are confident in the water (particularly the six year old). We need to find a new swimming teacher for them, ideally at Calypso Watermael Boitsfort on a Monday afternoon. I have a list of teachers but would appreciate a recommendation.
Many thanks,