Hi, I will be arriving Hangzhou at 11.35pm. There are 3 of us and we are going to Renhe hotel.

Don't worry. There still have airport shuttle bus at that time. Actually, the bus operates till the arrival of the last flight. Take shuttle bus to get to Main Railway Station (Chengzhan) first. Then take a taxi to arrive at the hotel directly. The cab fare is around CNY 20 in the night.

Yes, you can take the shuttle bus from the railway station. The operating hours are from 04:45 to 20:45 with the interval of around 30 mins. It costs CNY 20 per person.