I agree with you, I definitely would take a day or two off of venice and attach it to rome. Venice is nice for the short term. It's pretty, but VERY touristy. It's just sort of a great relaxing city where you're cool with being lost all the time.
There is just SO much to do in Rome that they should really spend a little more time there I feel (and I'm sure they'll want to go to the vatican while they're there). Rome was one of my favourite big cities: it has the great, relaxed vibe of italy, (even though it's a metropolis), the history/culture, and the beauty.
If you walk backwards, you'll find out that you can go forward and people won't know if you're coming or going.
Dream as if you'll live forever. Live as if you'll die today.
Countries I've Visited: Austria, Botswana, Canada, Costa Rica, Democratic Republic of the Congo, France, Germany, Greece, Hong Kong, Italy. Malawi, Mexico, Portugal, Rwanda, South Africa, Spain, Taiwan, Tanzania, Uganda, USA, UK, Vatican City, Zambia