Might you consider having them stay in Finsbury Park? I know it's not ideal because they would have to bus to and from your house, but I know a lovely lady who rents out a nice, newly refurbed room in her house on Mountview Road in Finsbury Park. I was in exactly your position, and my parents stayed with her and on a separate occasion my sister and her partner stayed there too. She charges much less than airbnbs too. Just send me a PM if you're interested and I'll put you in touch.
We might be able to help, I've sent you a connection so I can message you, let me know when you receive it.
Thank you very much, we will look at it
i think I got it yesterday and answered but not sure it worked?