What are the positive qualities in Frankenstein's relationship with the monster?

This is an excellent question, since Frankenstein's relationship with the monster is primarily negative. There are two places, however, I'd like to look for the positives.

First, in Chapter 4, Frankenstein discovers that he can reanimate life once it is dead. He then makes that his primary pursuit. Describing this moment to Clerval, he says that his discovery led to "delight and rapture." He envisions breaking the bonds of death and creating a new species.

While envisioning what this will look like, he says:

"A new species would bless me as its creator and source; many happy and excellent natures would owe their being to me. No father could claim the gratitude of his child so completely as I should deserve theirs."

He continues working through the summer and describes this time as "a most beautiful season." In essence, Frankenstein's feelings toward his creation can be compared to a mother anticipating the arrival of a newborn baby.

Frankenstein's ardor, however, is short-lived. In November of that year, Frankenstein gives life to his creation and the "beauty of the dream" he had felt before is quickly replaced with revulsion and horror. When the monster approaches Frankenstein in his bedchamber, Frankenstein flees.

The next time Frankenstein encounters the creature is in Chapter 10 after Frankenstein's brother William has been murdered and Justine has been falsely convicted. Frankenstein sets out to climb Montanvert to compose his thoughts and sees the creature following him. Frankenstein calls his creation a "Devil" and "vile creature." The creature seeks to explain himself, however, and Frankenstein relents. Frankenstein says,

"I felt what the duties of a creator towards his creature were, and that I ought to render him happy before I complained of his wickedness."

In other words, he feels that he owes his creation an explanation.

The monster recounts his story, and at the end (Chapter 17) asks Frankenstein to make him a female companion. Frankenstein describes that he was moved and could see the justice in the creature's argument. Later, however, Frankenstein will change his mind, which will trigger a destructive retaliation on the part of the creature.

To summarize, there are two moments where Frankenstein exhibits positive qualities in his relationship with the monster: 1) While Frankenstein is in the process of creating new life in Chapter 4, and 2) When Frankenstein consents to hear the monster's case (Chapter 10) and initially agree to making him a female companion (Chapter 17).