Accessed my neighbor's hard drive in "Shared"

I have a MacBook Pro, Mountain Lion, Airport Express.
I opened "Connected Servers" under "Shared" in the Finder Sidebar  today for the first time. I saw a few things there that were labeled "PC" that I couldn't access, but one of them I could access; I could see and open files on someone else' network storage device. By reading some things I found It belongs to my neighbor down the hall. I can also see his printer and media devices. I haven't been able to talk to him yet.
He is  not on my wireless LAN. I have it secured with WPA2 and MAC address access control, and I looked in the Airport Utility and no one is connected except me.
My ISP, Web-Pass, wired my apartment building and has a lot of customers here. I don't know if he is one or not.
Last week I accidentally clobbered all my network settings and had to reconfigure everything.  If I made a mistake re-entering them (like the subnet mask?), could I have connected my network segment with someone else's? That would be very scary. I had file sharing turned on with some sensitive stuff exposed because I didn't think anyone could get into my network. Could it be that easy? What else could be going on?

I had file sharing turned on with some sensitive stuff exposed because I didn't think anyone could get into my network. Could it be that easy?
Your wireless network is protected by whatever security protocol you chose to implement, and is as good as the passwords you use to protect it.
The computers and other devices that use it may also be protected with user names and passwords, even if you chose to enable file sharing. Apparently your neighbor simply decided to leave his NAS and other network devices unsecured. Assuming that is not an oversight, that's his decision. There is no law that says you can't leave your network and computers wide open for the world to see.
Make sure your AirPort Express also has a reasonably secure password associated with it. It should be different from your wireless network password, though it is not required to be. This prevents unauthorized changes to your Express's configuration, which is possible to do IF someone determines your wireless network password.

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