I havent had any practical experience with the Giotto but the couple of times Ive used the Diadema Junior (similar machine) the rattling created by the vibration pump was noticable. Ive heard of people pulling their machine apart and trying to dampen the sound by minimising metal on metal contact points. I dont think it was a big success. When I mentioned it to my local vendor he said, its only noisey for 25 seconds ;)
Hes got a point.
The other thing he suggested was if I wanted to I could house the pump outside the machine, but Im willing to put up with some rattling in short bursts.
I dont think there would be much to worry about with the steam wand incident. Im sure machines of this calibre are made to withstand much worse abuse.