I came to Amsterdam for a conference, and Xiong's place was perfect! It was as advertised: very clean, quiet, and comfortable. It's not downtown, but the bus (33) is very close and it's super easy to get to Amsterdam Centraal station.
My only regret is to not have met Xiong, who was away during my stay.
I would recommend Xiong's place to anyone on a budget who wants to visit Amsterdam.