Is the Abandonment Remedy Reasonable in this Situation?

The basics: My boyfriend and I are renting an apartment from a management company in California. We have had a leak in our roof for over two months now. We found out about the leak because it rained and water came through our ceiling in the living room. We complained to the leasing office and they fixed the ceiling, but they have not repaired the roof. It rained again a little less than a week ago, and we have water coming through our ceiling in the same spot. We complained again, and they sent a maintenance guy to come look at it, but the roof still has not been fixed, nor has the ceiling been repaired. The humidity has been high recently, so we are almost certain that mold is growing above our ceiling due to the moisture.

We've looked over our rights as tenants and this seems to be our favorite option (we're just so done dealing with them), but we were hoping for a second opinion. Does this sound reasonable?

More details:

We've given them a reasonable amount of time to make the repair, and El Niño is coming this year, which means lots and lots of rain. My boyfriend actually works for a roofing company, and they're currently swamped with people asking for repairs. The management company has had a history of being incredibly cheap, so they won't shell out more money to get work done. By the time it rains again, every roofing company around here will be completely booked, plus they're jacking up prices because the demand for their services is so high. Thoughts?