Thank you for your offer wolfina. I will keep that in mind.

But I hope you'll understand that the implication is to give a complete stranger free access to our flat and I don't think we'd be comfortable with that.
The best option would be to find a cat sitter or pension of proved reputation. If anyone has any recommendations, they are most welcome.
PS we are not in a hurry, it's just something that may come in handy in the future, as an alternative to taking the cat always with us or one of us staying home with her as we've done for many years so far.