Greetings from Viovio, thank you for your order.
Here is a link to our trouble-shooting with Aperture page: http://www.viovio.com/wiki/Apple+Aperture
You can use any template you want and as long as it's save per the instructions ( http://www.viovio.com/products/images/aperture-save-as-photo-book-pdf.jpg ) it will work just fine. We suggest to not allow text to go against the edge, instead to make sure that it's pulled in a bit - especially page numbers.
Then when you're ready you can upload it here: http://www.viovio.com/products/pdf/
If you have any further questions let us know and we'll do our best to help!