OP I agree with the previous posters that it would be best to visit HK for a week or so to get a feeling of the place, especially the air quality, whether you'll be able to handle it or not. (of course if you still have time to do so).
35.5K + housing allowance + teacher's salary, that seems like a great proposition, but you may or may not get the teaching job immediately and might have to do private tutoring, which could be quite lucrative or so I am told.
Yes, HK is noisy, but if your husband is willing to commute for 45 mins each way then you can find not only bigger flat for same cost, but quieter and less crowded too, look New Territories.
Good luck with your decision, and hope you enjoy HK as much as most of us do, if not all.