Alan is right....he is in a great place for treatment. With low grade bladder cancer which has not spread into the muscle, very often a "watch and wait" approach is considered best. BCG treatment, which is usually given for high grade, has not been shown to be as effective in low grade tumors.
It IS important to keep up with the cystoscopies, usually every three months for several years. The major problem with this type of bladder cancer is that it comes back. That is why you want to be sure that the urologist is keeping an eye on it.
Wishing you both the best of luck. Your partner is lucky to have you for support!
Sara Anne