I am arriving at 13:00 on 30/8/17 at Hongqiao Airport. I will need to get to Rayfont Downtown Hotel.

You are suggested to take a taxi there, it may take CNY 50-60 and about 20 minutes.
If you don't have many pieces of luggage, you can also take metro line 10 and transfer to line 12 at Shaanxi Rd. (S). Then get off at Jiashan Rd form exit 2, after that, walk east for about 700 yards, you will arrive at your hotel. it takes CNY 5 and about 30 minutes.