Letter at Cafe Fina

[nadiathesaint]

There's a letter:

My dearest Mario,

I seem to have gone missing while visiting my favorite niece. Bad timing, what with it being your birthday.

It's a good thing we have friends.

With their help, I've left clues. Can you follow them and find me?

I think you can.

Yours,
Elena

And a small card:

I

The daily commute
He's waiting for you to come
Six-eyed and wiggly.

And a trinket: