Guangzhou to Hangzhou, plus fuel and infrastructure costs, the cheapest is 470, but early or late, the discount in other time periods generally does not exceed 650.
Accommodation depends on what kind of accommodation you live in. There are 500-star hotels near the West Lake, and there are also chain-like hotels, less than 200. In fact, it's good to stay at home, clean, comfortable and warm.
You can visit Ctrip, E Long and other websites.