Hello Nicolas
Wanderer is a german Brand, which is using frames from the Czech framemaker Fort.
Fort frames are considered as very good value for money, so the frame should do the job.
Wanderer is in my eyes overpriced, there some different options to get a Fort frame or a fully completed travel bike.
Most of the equipment of the W-4 looks good, do you want to go with a Shimano set up or Rohloff?

Good alternatives consisting a Fortframe are Velotraum or Norwid (Modell Kattegat) (both pages in German). The offer real custom set up, so you can get exactly the parts you wish.

I don't know anythings about italian bikeshops. The reputation of both manufactures above is excellent and I'm sure that they will sent you the bike to Italy as well.

If you prefer a "I do it on my own" set up, check out www.fort-frames.cz where you can order a frame directly.

Cheers