hello banazz, I stayed in Prudential Hotel last year. Yes,it's an extremely convenient place becos it's located above the mtr station.
Another hotel u can consider is Kowloon Hotel. It's above TST MTR. This year, I stayed in YMCA in TST. It's very near the mtr station - about 3 mins walk. Good value for money and it's conveient too. I prefer YMCA to Prudential becos of the shopping in TST. I could go eat a decent supper and walk to HArbour City.