Apple's refurbished models are typically an excellent deal: a device that is indistinguishable from new, with a full one year Apple warranty. But I don't know if that's something they offer in Italy.
Regarding 16 vs 32 and wifi vs cellular:
Do NOT get the 16, even if you're not a consumer of videos or music and don't keep a lot of photos. Both iOS and apps are getting bigger and bigger--photos and videos can always be stored elsewhere (like Dropbox, or an external wireless drive), but apps cannot. The biggest device related mistake I've ever made was buying a 16 GB Mini last fall because I'd had two previous 16 GB ipads and I don't do movies or music on them. I'm forever having to delete games and other apps from it to make more room--I'm down to 500 MB, with 1 GB of photos on the device left to be removed. The rest is all apps, yet I'm running fewer of those than I ever have, and have removed all the terrific (but very large) reference apps that I bought iPads for in the first place.
As for wifi vs cellular: if you have a phone capable of a mobile hotspot (and a data plan that allows it), or if the ipad will never leave your house, or you're fine with using public wifi, the wifi only model is fine. Otherwise, get the cellular version.