Do not worry about the Italian, the important notes on the text are basically the same as those in English (but the Italian version has much more text than the English version). Take a look yourself to the demo version (the first 70 pages) and decide if it’s for you.
I’ve written a lot about the Athenaze in several posts (here, here and here), maybe you can find some comments of interest to you.
I’m actually sceptic about the Assimil audio, but I suppose that it can’t hurt to have it, though I don’t really know where you could get it at a reasonable price.