[chico]

Like zentharus said, use a redirect like the one I posted earlier.

Just to make it clear, all your files should be in the /public_html/ no matter if it's a subdomain or not.

Some cool reading I did, just if you want to know more about subdomains and what most people/sites use them for. http://en.wikipedia.org/wiki/Subdomain

[tyzoid]

So you are telling me that this cannot be done?

Like I said earlier, I don't mind the fact that there is two links to the same location, it's just that I've never seen this configuration previously. When I hosted the site myself, I had all the subdomains seperated.

If you have ever used freehostia, they keep all the subdomains seperated too:
/subdomain.domain.com/<files go here>
/subdomain2.domain.com/<files go here>

I just find it mildly annoying. It makes it seem more cluttered and disorganized.

Other than that, I think that 000webhost is one of the best and most feature-packed free web hosts I've used.

[Zentharus]

Tyzoid use redirect on your cPanel from the one you don't want them to access to the other one and it's all set