Dear Alya, here are my 2 cents,
Good to know that your maid will look after your kittens. Trust your maid but makesure clear instruction given. For the maid not to forget anything, probably you should write the instruction on a noticeboard or print it on large paper, paste at the most visible place.
Please, not caged them in a cage, let them roaming in your room. As long there's no access to outside world, you should not worry too much on the kittens accidentaly go out. Just make sure your house main door is always close most of the time and windows shut.
Good, call your maid dilligently and Have a Nice Holiday !!
