Supposedly, the code changes periodically. Even if you're not staying at any particular hotel, just go inside to the concierge and ask for a code as any hotel guest would do.
Go to Amalfi's restaurant upstairs and ask. As long as you are dressed appropriately, they will give it to you. It changes every other month or so.
Ask the concierge at his hotel.
Or upstairs from the Red Phone Booth is an Italian Restaurant and you can get it from them.
Your going to have to work for it. That's a part of the experience. Good luck to Sir.
The fun is in getting the coffee. Remember there is a dress code
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