single page for an specific user

I'm trying to give access to one user to an specific set of pages.
user1 = page 1, 1.1 and 1.2
user2 = page 2, 2.1 and 2.2
I'd really appreciate your help to find out an easy way to do it. Membership plugin looks too complex for this. So any idea is more than welcome!

Thanks a lot!