Hi Treesy, I'm so excited for you

Most importantly, when is your birthday, and where do you want to spend that?!
I'd suggest....65% Peru & 35% Bolivia.....just because Peru is bigger, so there's more places you can go.
I have my fingers and toes crossed for you that Macchu Picchu will be open - perhaps try and leave it as best you can to the end of your trip, then...maybe....
I agree with 'laorfamily' about Cuzco - I loved it there. If you want, I could put you in touch with my friend Rocsana - she was my Spanish teacher there and is lovely - she doesn't have any kids unfortunately, but she might be a good chum for you to get to know some locals? No worries if not (and I don't know if she's definitely still in Cuzco! But I will ask if you want me to, as I am still in touch with her. While I was studying Spanish with her, I stayed with a family too, but their kids are a bit older - probably 12ish by now I think?!)