Milano Centrale - Fiera - get the yellow underground line to Duomo, then change to the red line direzione Molino Dorino, get off at Amendola fiera or Lotto.
Oh no about the navetta! Someone has got a thread on here about a Bugaboo bought in the UK in a really crappy state, tis most shocking. Have you tried to contact the seller? What did he/she say? You could reasonably ask for a refund, particularly if you paid with Paypal, as goods not matching description. Ideally you should have done it before washing, but the fact that it rocks means it's unsafe in any case so you have good grounds for a total refund.
In the meantime, until you find a new navetta, could you not perhaps use a sling in the very first weeks when DD2 is tiny? I have a ring sling going spare if you want it, they're brilliant with newborns (hold them in foetal position, good for feediing and all that).
I want to know all the details too Hot.