Hi there. I've only been to Austria briefly but have spent some time in Italy over the years, both independently and with JY.
My first holiday with JY was to the Cilento Coast in Italy. In fact I was on the first trip out there. It's still quite uncommercialised but the hotel is great and it has become a very popular tour here. The reviews here speak for themselves.
My other Italian holiday was just this last October with JY to Tuscany. It represented really good value for money, with great taster trips to Pisa, Siena and Florence amongst others. The hotel is small and lovely with great staff and good food.
I've also been to Croatia with JY and this May I am going to Slovenia.
As so many others have said here just pick something and go for it. You won't regret it!