I had an itinerary where we would start in Bavaria and end up in Northern Italy then on to Rome. After talkin with my wife she really wanted to go to Florence so I'm cutting Germany out and doing three main hubs in Italy.
Let me know what you think of the pace here. I know it is a lot but we can drop some of the side trips.
Day, Itinerary, Sleep in
0 Final packing, Home
1 Depart Austin, Plane
2 Train Milan to Vicenza, Vicenza
3 Padova or Verona, Vicenza
4 Venice, Vicenza
5 Dolomites, Vicenza
6 Vicenza, Vicenza
7 Train to Florence 2 hrs, Florence
8 Florence, Florence
9 Florence, Florence
10 Siena, Florence
11 Pisa, Florence
12 Train to Rome 1.5 hrs, Rome
13 Rome, Rome
14 Vatican City, Rome
15 Rome, Rome
16 Train Rome to Milan, Milan
17 Depart Milan