M.W.
Hi K.,
I don't know if you have picked something yet, but we did some research and went to Italy last year for 3 1/2 weeks. We only have one boy, he was 10 months at the time. We bought the Silver Cross Micro stroller from http://www.silvercrossamerica.com/micro_stroller.php. It is super light weight, folds down with one hand while you're holding your child in the other, has a strap for over your shoulder, and the wheels swivel and it goes over bumps and curbs like a pro. We visited 7 cities in 2 1/2 weeks, carrying everything on the train and this traveled very well. Our son slept in it too, although the one drawback was that it didn't recline. Happy searching.