In 1984, what does Winston think when he sees the place Julia selects for their rendezvous?
I suspect that he thinks of the "place where there is no darkness," a place of peace, tranquility, and love. Of course, the real place where there is no darkness is in the Ministry of Love where those being "retrained" are kept constantly bombarded by light. This is a similar technique to what is often used in intense interrogation, especially when sleep deprevation is one of the major weapons.
Winston didn't get the peace with Julia and he certainly didn't get it when O'Brien's promise was fulfilled.