Hi and
to Purrs.
Always worrying when we have to leave our little darlings
I am lucky as my friend takes care of Bonnie for me.
I think if they get used to them at a young age they will be ok. The people running the cattery should be up on how to take care of kittens and they shouldn't let any one stay who has not had their jabs.
I was gong to say it's better if you know someone who can recommend a place to you but you've gone one step further and know someone who works there
Just for a few days and lots of fuss made of and toys to play with and no time to be stressed. I would take a fave toy, blanket, bed etc.
Good luck.
Mary