That’s a little over $11,000 per month. Not bad. Kowloon Tong is a wealthy area. Mostly at least. Nice area. So living there might be expensive. If you don’t like the nightlife too much plus you like being away from it all then you can move outward from Kowloon Tong. New Territories? They have less expensive housing. As we all generally know about HK is that the most expensive part is the housing. Rent or buy.
Personally I like HK Island side more. More to do. Better Bars. Restaurants. Lan Kwai Fong is there. Great for a drink. Plus the infamous Wan Chai area. Since you will be on the side of Kowloon then you both will have to get a drink at Ozone! It’s at the top of the sleek looking Ritz Carlton hotel! At 118 stories high! Incredible view on a clear day! I once took some photos from up there and sent them to friends in Los Angeles. They thought I had taken the photos from an airplane! Anyway, good luck! HK is great. My favorite Asian city.