Overall it was a nice stay and the helpful counter staff upgraded the room for us after we complained.
However there were some issues about the information provided by Hotel.com. Firstly, not every room has deep-soaking bathtub, the description about the room should be specific.
Secondly, the hotel only provided one person breakfast and we had to pay 60 RMB for another person, which was not indicated.
Last but not least, it was not easy to get taxi in Hangzhou, luckily the counter staff called taxi for us.