I booked a one way rental on autoeruope from Orvieto to La Spezia. Funny thing is they say to pick up at the: Orvieto City Office Viale I Maggio, 57
How do I interpret this as an address? Also they didn't say what company the rental was through, I was under the impression that they offer rentals through various agencies.

Didn't they send you a voucher? They always send me one, and it's always plain to see what company you're picking up from.

Also, it's easy enough to call them if you have questions like this: 1-800-223-5555. In fact, I always call them to make the reservation. They're great at customer service and you can iron out details with them so much better than by using the website.

Forgot the other part of your question. Not sure what's confusing you, though. That's the address: Viale I Maggio, 57 - which means number 57, Viale I Maggio.

So the only name on the voucher besides autoeurope is Quickcar, which I assumed was the name of their reservation system/process since I have never heard of it before.

Yeah, QuickCar is just Autoeurope's name for their little web-based ordering process.

I do note that there's an Avis office at Viale I Maggio 57 in Orvieto. So maybe you'll be getting your car from Avis. But I agree with the others' comments: (1) it should say the name of the rental company on the voucher, and (2) AutoEurope is phenomenally easy to reach on the phone and ask about details like this.