I did it my way.
It works only if you have an administrator account (who has installed the system), but work normally as an ordinary restricted user.
Create a mount point in the private area of the admin.
Login as the administrator.
chmod 700 Reserved but it seemed to be overwritten after booting.
In /etc/fstab add a line like:
/dev/sda1 /media/ADMIN-NAME/Reserved ntfs -r 0 0
where sda1 and ADMIN-NAME have to be adapted to your situation.
That's it. As an administrator, you may test your fstab by:
sudo mount -a
and a subsequent mount.
The administrator has access to the Windows partition for emergencies.
The -r option in fstab should allow for read access only, but I preferred not to try.
A normal user gets an error message when he wants to access the partition.
This remains true even if he has acquired access to another Windows partition (maybe for common data like photos, etc.).