What do you mean by "accessible"? Out of the box, most Linux servers support ssh. There are quite a few ssh clients that work on Windows, the most popular one probably being PuTTY. To create a user, a one-line useradd command is sufficient, and userdel is even simpler. You can use disk quota to limit the size, which seems to be one of your requirements.
Or if you need Windows shares, the tool is Samba. It requires additional setup, but creating and deleting users is easy with pdbedit.
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